Title of Invention	A PROCESS FOR PREPARATION OF HYDROXYBIARYLPHOSPHINES
Abstract	The present invention relates to a process for the preparation of hydroxybiarylphosphines of the formula in which R1, R2, a, b, Ar-Ar, R3 and R4 have the meaning bel, by reacting an oxaphosphorine of the formula in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the Ar-Ar bond, with a compound R -Me and R4-Me, in which R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or with a compound Me-R -R -Me, in which -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated. Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a temperature of -40 to 160°C, then adding water and, if appropriate, a water-insoluble organic solvent and separating the aqueous phase from the organic phase. The invention further relates to compounds selected from the group consisting of the hydroxybisarylphosphixines.

Title of Invention

A PROCESS FOR PREPARATION OF HYDROXYBIARYLPHOSPHINES

Abstract

The present invention relates to a process for the preparation of hydroxybiarylphosphines of the formula in which R1, R2, a, b, Ar-Ar, R3 and R4 have the meaning bel, by reacting an oxaphosphorine of the formula in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the Ar-Ar bond, with a compound R -Me and R4-Me, in which R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or with a compound Me-R -R -Me, in which -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated. Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a temperature of -40 to 160°C, then adding water and, if appropriate, a water-insoluble organic solvent and separating the aqueous phase from the organic phase. The invention further relates to compounds selected from the group consisting of the hydroxybisarylphosphixines.

Full Text	- 1A - a present invention relates to a process which is improved with respect to the prior art for the preparation of hydroxybiaryl-phosphines and novel compounds of this group as substances. Hydroxybiarylphosphirtes are important intermediates, for example in the synthesis of phospbinophosphite ligands of the formula (A) The hydroxybiarylphosphines, prepared according to the present invention, are used as starting materials for the preparation of phosphite igands. Such 1igands are used for the preparation of transition metal complexes, which are useful in the preparation of optically active a1dehydes. The abovementioned phosphinophosphite 1igands are used in enantioselective hydrofarmylation (EP 0614901, EP 0614902, EP 0614903, EP 0614870), By means of ensntioselective hydroforroy-lation, by reacting a suitable olefin with carbon monoxide and hydrogen, optically active aldehydes, for example, can be prepared - The preparation of the hydroxybiarylphosphines required as intermediates for the preparation of the phosphinophosphite ligands is described in more detail in HP 0614903 and in Tetrahedron Letters, 31, 6321 (19900 and J org Chem 58, .1945 (1993). It starts from dihydroxybiary1 compounds and proceeds via not less than 4 stages, described in more detail by the reaction equations below- Some of these reaction stages are costly and are associated, furthermore, with high expenditure for the necessary purification steps. iA 2 The reaction proceeds via the following 4 stages: 1st stage Tf2O: Trifluoromethylsulfonic anhydride 2nd stage 3 3rd stage 4th stage HSiCl3: Trichlorosilane NEt3: Triethylamine HSiCl3: Trichlorosilane NEt3: Triethylamine A further disadvantage of this process is that a disub-stituted phoaphine oxide, that is diphenylphosphine oxide, must be employed in the second stage. However, only a restricted number of suitable disubstituted phosphine oxides are available. This considerably restricts the possibilities of this synthesis. A further critical disadvantage is the fact that diphenylphosphine oxide reacts at random with one of the two TfO radicals. This reaction is therefore not suitable for specifically substituting one of the two TfO radicals by the diphenylphosphine oxide radical. A mixture of both substitution products always forms. This is a disadvantage, in particular, when unsyrametri-cal dihydroxybiaryl compounds are used, since mixtures 4 form which cannot be separated into the individual components, or can only be separated with a disproportionately high expenditure. This process is therefore chiefly suitable only for the reaction of symmetrical dihydroxybiaryl compounds in which the two hydroxyl groups are identical in the sense of being indistinguishable. In this case, it does not actually matter which of the two hydroxyl groups or TfO radicals are exchanged for the diphenylphosphine oxide, since an exchange of the one hydroxyl group or of the one TfO radical always leads to the same end product as exchange of the other hydroxyl group or of the other TfO radical. There is therefore vigorous interest in providing a process for the preparation of hydroxybiarylphosphines which does not have the above described disadvantages, can be implemented industrially without great expense starting from comparatively readily accessible starting materials, does not start from dihydroxybiaryl compounds and is therefore also not restricted to the reaction of symmetrical dihydroxybiaryl compounds. This object is achieved by a process for the preparation of hydroxybiarylphosphines of the formula in which R1, R2, a, b, Ar-Ar, R3 and R4 have the meaning below. It comprises reacting an oxaphosphorine of the formula in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1-binaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 car- 5 bon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-O bond are each arranged in the ortho-position to the Ar-Ar bond, with a compound R3-Me and R4-Me, in which R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialfcylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or with a compound Me-R3-R4-Me, in which -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated. Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a temperature of -40 to 160°C, then adding water and, if appropriate, a water-insoluble organic solvent and separating the aqueous phase from the organic phase. The reaction proceeds, as described for example by the equation below, with cleavage of the P ring in the oxa-phosphorine (II): It is to be considered as highly surprising that it is possible using the process of the invention to open the phosphorus-containing ring in the oxaphosphorine of the formula (II) with very high selectivity, not only the Ar-Ar bond, but also at the same time the Ar-P bond remaining unchanged. 6 This ensures that even when unsymmetrical oxaphosphorines are used, a uniform hydroxy-biarylphosphine is always formed and not a mixture containing various hydroxybiarylphosphines and other byproducts and breakdown products. Furthermore/ the process of the invention permits the phosphorus atom to be specifically substituted either by two identical radicals or by two different radicals. The process of the invention, moreover, starts from comparatively readily accessible oxaphosphorines of the formula (II) whose preparation is subject-matter of a German patent application (File number: 195 21 339.4) filed on the same day as the present patent application. A further advantage of the process of the invention is that it is not necessary to isolate one of the intermediates between the individual working steps in order then to process this further. In order to illustrate which oxaphosphorines of the formula (II) can be used, the following compounds of the formulae (IIIa), (IV), (IV), (IVa) and (V) may be mentioned, but without making in this case any claim as to completeness of the enumeration. The oxaphosphorines of the formula (III) are derived from 6-chloro-6H-dibenz[c,e][l,2]oxa- phosphorine or 6-bromo-6H- dibenz[c,e][l,2]oxaphosphorine. The oxaphosphorine of 7 the formula (IlIa) is 6-chloro-6H-4-phenyldibenz[c,e][1,2]oxaphosphorine or 6-bromo-6H-4-phenyldibenztc,e][1,2]oxaphosphorine. The oxaphosphorines of the formula (IV) containing a 1-phenylnaphthyl radical as Ar-Ar are derived from 6-chloro-6H-benzo[e]naphth[2,1-c][1,2]oxaphosphorine or 6-bromo-6H-benzo[e]naphth[2,1-c][1,2]oxaphosphorine and the oxaphosphorines of the formula (IVa) similarly containing a 1-phenylnaphthyl radical as Ar-Ar are derived from 5-chloro-5H-benzo[c]naphth[1,2- c][1,2]oxaphosphorine or 5-bromo-5H-benzo[c]naphth[l,2- c][1,2]oxaphosphorine. The oxaphosphorines of the formula (V) containing a 8 binaphthyl radical as Ar-Ar are derived from 3-chloro-3H-dinaphtho[2,l-c:l',2'-e]-[1,2]oxaphosphorine or 3-bromo-3H-dinaphtho-[2,lc:l' ,2' -e][1,2]oxaphosphorine. It is understood that, in the abovementioned formulae, R1, R2, a and b have the meaning already given. Compounds of particular interest are oxaphosphorines of the formula (II) in which R1 and R2 have the meaning mentioned above and a is 0 and b is 1 or a is 1 and b is 0. These oxaphosphorines are relatively readily accessible, since they only have one radical R1 and R2, and at the same time they are unsymmetrical. Particular preference is to be given to oxaphosphorines of the formula (II) in which a and b are each 0. The process of the invention can be carried out with great success by using an oxaphosphorine of the formula (II) , in which R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 4 carbon atoms or are substituted or unsubstituted phe-nyl, a and b are identical or different and are an integer from 0 to 2, in particular a is 0 and b is 1 or a is 1 and b is 0, and by using, in particular, an oxaphosphorine of the formula (II), in which R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 4 carbon atoms, a and b are identical or different and are 0 or 1, in particular a and b are different and are 0 or 1. According to a process variant, an oxaphosphorine of the formula (II) is used, in which Ar-Ar is 9 1-phenylnaphthyl and the Ar-P bond is arranged on the phenyl ring of the 1-phenylnaphthyl or on the naphthyl ring of the 1-phenylnaphthyl. These oxaphosphorines can, as already described by the compounds of the formulae (IV) and (IVa), be substituted by (R1)a and (R1)b, oxaphosphorines of this type, in which a is 0 and b is 1 or a is 1 and b is zero or in which a and b are each zero, because of their relatively good availability, achieving particular interest. As compounds R3-Me and/or R4-Me or Me-R3-R4-Me, in which R -R4 are joined together and form a chain having 3 to 5 carbon atoms and the chain can be substituted or unsubstituted, in particular one or two aromatic rings or ring systems each having 6 to 10 carbon atoms can be anellated to the chain, use can generally be made of organometallic compounds. Me is, for example, MgX, where X is chlorine, bromine or iodine, in particular chlorine or bromine, or an alkali metal, for example lithium, sodium or potassium, in particular sodium or lithium, preferably lithium. The reaction is carried out in the presence of a solvent. It is advisable to use as solvent a dipolar aprotic solvent or a nonpolar solvent or a mixture of these solvents. In this context, it may be noted that organometallic compounds are usually handled in specific solvents. Grignard compounds are frequently used dissolved or suspended in an ether. The solvents used can be, without making any claim as to the completeness, an ether or an ether mixture, for example dialkyl ether having 2 to 4 carbon atoms per alkyl, tetrahydrofuran, dioxane, toluene, ortho-xylene, meta-xylene, para-xylene, a mixture of isomeric xylenes, mesitylene, ethylbenzene or mixtures of these solvents. The reaction is presumed to proceed in two stages, one 10 equivalent of the organometallic compound first reacting with the oxaphosphorine. In this case, the X on the P atom in the oxaphosphorine of the formula (II) is probably substituted. In a subsequent stage, a further equivalent of the organometallic compounds reacts with the previously-substituted P atom of the oxaphosphorine, the ring probably being opened by cleavage of the P-0 bond. Utilizing this reaction sequence, the oxaphosphorine of the formula (II) can first be reacted with the compound R -Me and then with the compound R4-Me or, vice versa, the oxaphosphorine of the formula (II) can first be reacted with the compound R4-Me and then with the compound R3-Me. By this means, hydroxybiarylphosphines of the formula I are obtained in a simple manner whose P atom, because of the substitution by two different radicals R3 and R4, has in total three different radicals, that is the hydroxybiaryl radical, the radical R3 and the radical R4. This reaction sequence can of course also be applied to the reaction of the compound Me-R3-R4-Me, the phosphorus atom being incorporated into a ring. In most cases it is sufficient to carry out the reaction at a temperature of 40 to 160°C, in particular 60 to 120°C. This relates to the entire reaction sequence, that is both stages. However, the reaction can also be allowed to proceed in a first stage at -40 to 80, in particular -20 to 60, preferably -10 to 50, °C and then in a second stage at 20 to 160, in particular 40 to 140, preferably 60 to 120, °C. The reaction conditions also depend to a certain extent on the type of organometallic compound used. 11 Organometallic compounds having a high reactivity/ for example alkyl-Grignard compounds or alkali metal alkyls, can be reacted even at very low temperatures, whereas less reactive organometallic compounds, for example aryl-Grignard compounds, necessitate higher reaction temperatures. However, the reaction conditions also depend to a certain extent on the type of the oxaphosphorine used. Oxaphosphorines of the formula (II) having elevated reactivity can be reacted at lower temperatures. These may include oxaphosphorines whose P-containing ring is under stress, for example owing to twisting of the two aryl radicals with respect to each other about the Ar-Ar bond. Oxaphosphorines whose p-containing ring has no stress, or only low stress, or oxaphosphorines whose P atom is sterically hindered owing to bulky substituents and is not freely accessible to an attack by the organometallic compound can, in contrast, make a reaction at elevated temperatures necessary. Usually, a solution of the oxaphosphorine of the formula (II) is introduced, one of the abovementioned solvents being able to be used. A solution or suspension of the organometallic compound R3-Me, R4-Me or Me-R3-R4-Me is added dropwise with stirring to this solution. The organometallic compound is used in the stoichiometrically required amount or in a stoichiometric excess. In the first reaction stage, 1.0 to 1.5, in particular 1.0 to 1.3, mol of the organometallic compounds R3-He or R4-Me or Me-R3-R4-Me are added per mol of oxaphosphorine of the formula (II), and in the second reaction stage, 1.0 to 1.5, in particular 1.0 to 1.3, mol of the organometallic compounds R3-Me or R4-Me are added per mol of oxaphosphorine of the formula (II)o The reaction proceeds in the absence of water, due to the use of the water-sensitive organometallic 12 compounds. It Is advisable to allow the reaction to proceed under a protective gas atmosphere, for example under anhydrous N2 or argon. The procedure can alternatively be performed the other way round and the solution or suspension of the organo-metallic compound can be introduced and the oxaphos-phorine or the solution of the oxaphosphorine can be added with stirring. After completion of the reaction, the reaction mixture is cooled, if a high reaction temperature should make this necessary, and water is added. The addition of water is necessary in order to hydrolyse any organometallic compounds still present and to hydrolyse the products formed due to the reaction. In order to promote or induce the phase separation, a water-insoluble organic solvent can be added to the reaction mixture. Usually, toluene, ortho-xylene, meta-xylene, para-xylene, mixtures of isomeric xylenes, mesitylene, ethylbenzene, esters which are derived from a carboxylic acid, in particular an aliphatic carboxylic acid having 1 to 8, in particular 1 to 4, carbon atoms and an aliphatic alcohol having 1 to 8, in particular 1 to 4, carbon atoms, for example ethyl, propyl or butyl acetate, are suitable for use as water-insoluble organic solvent. In some cases, it can be useful to adjust the reaction mixture or the aqueous phase contained therein to a pH 13 The hydroxybiarylphosphines of the formula (I) are usually further purified by crystallization. The process of the invention may be carried out continuously or discontinuously, particularly simply discon-tinuously. It may be carried out at superatmospheric pressure, atmospheric pressure or reduced pressure, particularly simply under the reaction pressure which establishes itself. The present invention further relates to novel hydroxybiarylphosphines of the formula I in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, in particular 1-phenylnaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the Ar-Ar bond, R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl) 2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated, and, together with the P atom, forms a ring having 4 to 6 members, with the proviso that Ar3-(R5)n is not phenyl or a phenyl substituted by halogen, alkyl or alkoxy each having 1 to 8 carbon atoms, if Ar-Ar is biphenyl or 1,1'-binaphthyl and R3 and R4 are identical in each 14 case. The invention relates in particular to hydroxybiaryl-phosphines of the formula (I), in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1-binaphthyl, in particular 1-phenylnaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 4 carbon atoms or substituted or unsubstituted phenyl, a and b are identical or different and are an integer from 0 to 2, in particular 0 or 1. The invention further relates to hydroxybiarylphosphines of the formula (I), in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, in particular 1-phenylnaphthyl, R3 and R4 are identical or different and are alkyl having 1 to 4 carbon atoms, cycloalkyl having 4 to 6 carbon atoms, benzyl, Ar3-(R5), where Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 4 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl) 2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, with the proviso that Ar3-(R5)n is not phenyl or a phenyl substituted by halogen, alkyl or alkoxy having in each case 1 to 8 carbon atoms, if Ar-Ar is biphenyl or 1.1'-binaphthyl and R3 and R4 are identical. In the event that Ar-Ar is 1-phenylnaphthyl, a feature of the novel hydroxybiarylphosphines is that the radical -PR3R4 is arranged either on the phenyl ring of the 1-phenylnaphthyl or on the naphthyl ring of the 1-phenylnaphthyl. Without making any claim as to completeness, tne following substances may be mentioned as novel compounds: 2-diphenylphosphino~l"(2-hydroxyphenyl)naphthalene 15 2-dicyclohexylphosphi-no-1- (2-hydroxyphenyl)naphthalene 2-bis-(4-fluorophenyl)phosphino-l-(2-hydroxyphenyl)-naphthalene 2-bis-(2-methoxyphenyl)phosphino-l-(2-hydroxyphenyl)- naphthalene 2-bis-(2-methylphenyl)phosphino-l-(2-hydroxyphenyl)- naphtha1ene 2-(4-fluorophenyl-phenyl)phosphino-l-(2 -hydroxyphenyl)- naphthalene 2-(2-methoxyphenyl-phenyl)phosphino-l-(2- hydroxypheny1)-naphthalene 1-[2-(diphenylphosphino)phenyl]-2-hydroxynaphthalene 1-[2-(dicyclohexylphosphino)phenyl]-2- hydroxynaphthalene l-{2- [bis-(4-fluorophenyl)phosphino]phenyl}-2-hydroxy- naphthalene 1-[2-(4-fluorophenyl-phenyl)phosphino-phenyl]-2- hydroxynaphthalene 1-[2-(2-methoxyphenyl-phenyl)phosphino-phenyl]-2- hydroxynaphthalene 2-(diisopropyl)phosphino-l-(2-hydroxyphenyl)naphthalene 2-[Bis-(4-N,N-dimethylaminophenyl)phosphino]-1-(2- hydroxyphenyl)naphthalene 2-[bis-(4-N,N-diisopropylaminomethylphenyl)phosphino]- 1-(2-hydroxyphenyl)naphthalene 2-{bis-[3,5-bis-(trifIuoromethyl)phenyl]phosphino}-1- (2-hydroxyphenyl)naphthalene 1-[2-(diisopropylphosphino)phenyl]-2-hydroxynaphthalene l-{2-[bis-(4-N,N-dimethylaminophenyl)phosphino]phenyl}- 2-hydroxynaphthalene l-{2-[bis-(4-N,N- diisopropylaminomethylphenyl)phosphino]phenyl}-2- hydroxynaphthalene l-{2-{bis- [3, 5-bis- (trif luoromethyl)phenyl] phosphino}- phenyl}-2-hydroxynaphthalene 16 2 ' -hydroxy-2 - [2 -methoxyphenyl (phenyl) phosphinol biphenyl 2'-hydroxy-2-[isopropyl{phenyl)phosphinojbiphenyl 2'-hydroxy-2-[cyclohexyl(phenyl)phoaphino3 biphenyl 2-{bis-[3,5-bis-(trifluoromethyl)phenyl}phosphino}-2'- hydroxybipheny1 2-diisopropylphosphino-2'-hydroxybiphenyl 2- [bia- (4-N,N-dimethylaminophenyl)phosphino3 -2' - hydroxy-biphenyl 2- [bis- (4-N,H-diisopropylaminomethylphenyl)phosphino3 - 2' -hydroxybiphenyl 2-diphenylphosphino-2'-hydroxy-3'-phenylbiphenyl 2'-hydroxy-2-[2-methoxyphenyl(phenyl)phoaphino]-1,1'- biphenyl 2-{bis-[3,5-bis-(trifluoromethyl)phenyl]phosphino}-2'- hydroxy-1,1'-binaphthyl 2-diisopropylphosphino-2'-hydroxy-l,l'-binaphthyl 2-[bis-(4-N/N-dimethylaminophenyl)phosphino]-2'- hydroxy-1,1'-binaphthyl 2-[bis-(4-N,N-diisopropylaminomethylphenyl)phosphino3- 2'-hydroxy-1,1'-binaphthyl 2'-hydroxy-2-[(isopropylpheny1)phosphino]-1,1'- binaphthyl 2' -hydroxy-2-[(cyclohexylphenyl)phosphino]-1,1- binaphthyl The following examples describe the invention in more detail without restricting it thereto. Experimental part Example 1 Preparation of 2' -hydroxy-2-diphenylphosphinobiphenyls 12.3 g (52.4 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxa-phosphorizxe in 80 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and 66 ml of a 2M solution of phenylmagnesium bromide in 17 tetrahydrofuran are added dropwise. The temperature increases in the course of this from 25 to 40°C- The mixture is then stirred for 4 hours at 65°C, cooled to room temperature and loo ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 19.0 g of colorless oil are obtained. By crystallization with aethanol/water, 10:1, 18.1 g (98%) of colorless crystals having melting point 123 to 124°C are obtained. 31P-NMR (CDC13): d = -11.7 ppm Example 2 2l-Hydroxy-2-(bis-(3-fluorophenyl)phosphino]biphenyl: 16.4 g (70 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxa-phosphorine in 80 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and a 2M solution of 140 mmol of 3-fluorophenylmagnesium bromide in tetrahydrofuran is added dropwise. The temperature increases in the course of this from as to 45°C. The mixture is then stirred for 12 hours at 65°C, cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid/ the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 25.8 g of colorless oil are obtained. By crystallisation with methanol/water, 10:1, 19.8 g (71%) of colorless crystals having melting point 161 to 163°C are obtained. 31P-NMR (CDCI3): d = -11.0 ppm 18 Example 3 Preparation of 2'-hydroxy-2-[bis(1-naphthyl)phosphinoj-biphenyl: 14.1 g (60 mmol) of 6-chloro-6H-dibenz[c,e] [1,2]-oxaphosphorine in 50 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and a solution of 150 mmol of l-naphthylmagnesium bromide in tetrahydrofuran is added dropwise. The temperature increases in the course of this from 25 to 45°c. The mixture is then stirred for 3 hours at 80°C and 5 hours at 12O°C The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 19.0 g of colorless oil are obtained. By crystallization with methanol/water, 10:1, 22.8 g (89%) of colorless crystals having melting point 255 to 256°C are obtained. 31P-NMR (CDC13): d = -30.3 ppm Example 4 Preparation of 2'-hydroxy-2-[(2-methoxypheny1-phenyl)phosphino]biphenyl: 23.5 g (100 mmol) of 6-chloro-6H-dibenz[c,e][l,2]oxa-phosphorine in 50 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and a solution of 100 mmol of 2-methoxyphenylmagnesium bromide in tetrahydrofuran is added dropwise at -10°C. The mixture is slowly heated to 25°C and stirred for 3 hours. A solution of 100 mmol of phenylmagnesium bromide in 150 ml of tetrahydrofuran is added dropwise and the mixture is then stirred for 5 hours at 65°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute 19 hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 38.0 g of colorless oil are obtained. By crystallization with methanol/water, 10:1, 32.7 g (86%) of colorless crystals having melting point 137 to 139°C are obtained. 31P-NMR (CDC13) : d = -22.0 and -23.2 ppm (diastereomer ratio 30:70) Example 5 Preparation of 2'-hydroxy-2-[(2-tolyl-phenyl)-phosphino]biphenyl: 16.4 g (70 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxa-phosphorine in 50 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and a solution of 70 mmol of 2-tolylmagnesium bromide in tetrahydrofuran are added dropwise at -10°C. The mixture is slowly heated to 2 5°C and stirred for 3 hours. A solution of 70 mmol of phenylmagnesium bromide in 50 ml of diethyl ether is added dropwise and the mixture is then heated to 65°C, the diethyl ether being distilled off. The mixture is stirred for a further 2 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 25.8 g of colorless crystals are obtained. By recrystallization from methanol/water, 10:1, 20.4 g (79%) of colorless crystals having melting point 98 at 101°C are obtained. 31P-NMR (CDCI3) : d = -19.7 and -20.2 ppm (diastereomer ratio 50:50) 20 Example 6 Preparation of 1- (2-hydroxyphenyl) -2-diphenylphosphino-naphthalene: 50.8 g (178 mmol) of 6-chloro-6H-benzo[c]naphth[2,i-c]-[l,2]oxaphosphorine in 250 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and 390 ml of a 2M solution of phenylmagnesium bromide in diethyl ether are added dropwise. The temperature increases in the course of this from 25 to 40°C. The mixture is then slowly heated to 100°C, the diethyl ether distilling off, and is stirred for 3 hours. The mixture is cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sul-fate and concentrated under reduced pressure. 70 g of colorless oil are obtained. By crystallization with methanol, 63.8 g (89%) of colorless crystals having melting point 104 to 106°C are obtained. 31P-NMR (CDC13) : d = -12.0 ppm Example 7 Preparation of 1-(2-diphenylphosphinophenyl)-2-hydroxy-naphthalene 9.5 g (33.5 mmol) of 5-chloro-5H-benzo[c]naphth[l,2-e]-[1,2]-oxaphosphorine in 50 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and 28 ml of a solution of 84 mmol of phenylmagnesium bromide in diethyl ether are added dropwise. The temperature increases in the course of this from 25 to 40°C. The mixture is then slowly heated to 100°C, the diethyl ether distilling off, and is stirred for 3 hours. The mixture is cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mix- 21 ture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sul-fate and concentrated under reduced pressure. 13.5 g of colorless oil are obtained. By crystallization with methanol, 9.5 g (70%) of colorless crystals having melting point 135 to 138°C are obtained. 31P-NMR (CDC13): d = -12.7 ppm Example 8 Preparation of 2- [bis- (3-fluorophenyDphosphino] -1- (2-hydroxyphenyl)naphthalene: 8.5 g (30 mmol) of 5-chloro-5H-benzo[c]naphth[1,2-e]-[1,2]-oxa-phosphorine in 50 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 70 mmol of 3-fluorophenyl-magnesium bromide in 80 ml of o-xylene is added dropwise. The temperature increases in the course of this from 80 to 90°C. The mixture is then stirred for 1 hour at 110°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 19.0 g of colorless oil are obtained. 31P-NMR (CDCI3): d = -3.8 ppm Example 9 Preparation of 2-(dibenzophosphol-9-yl)-2'-hydroxy-biphenyl: 46 ml of a 1.6 M solution of butyllithium in hexane are added dropwise to a solution of 11.4 g (36.54 mmol) of 2,2'-dibromobiphenyl in 60 ml of diethyl ether. The mixture is then stirred for 24 hours at 20°C. To this 22 is then added, at 0°C, a solution of 8.6 g (36.5 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorine in 30 ml of o-xylene. The mixture is then stirred for a further 2 hours at 25°C and 3 hours at 50°C. The mixture is cooled to room temperature and 100 ml of water are carefully added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. By crystallization of the residue with 2-butanone, 11.8 g (90%) of colorless crystals having melting point 152 to 155°C are obtained. 31P-NMR (CDC13) : d = -17.8 ppm Example 10 2-{Bis-[3,5-bis-(trifluoromethyl)phenyl]phosphino}-2'-hydroxybiphenyl: 23.5 g (0.1 mol) of 6-chloro-6H- dibenz[c,e][1,2]oxaphosphorine in 200 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.23 mol of 3,5-di{trifluoromethyl)phenyl-magnesium bromide in 300 ml of tetrahydrofuran is added dropwise. Tetrahydrofuran is distilled off and the temperature is slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature, and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 61.0 g of black solid are obtained. By recrystallization from heptane, with addition of activated carbon, and subsequent hot filtration, 37.2 g (59%) of pale yellow crystals having melting point 120 to 121°C are obtained. 31P-NMR (CDC13): d = -8.4 ppm 23 Example 11 Preparation of 2-diisopropylphosphino~2'-hydroxybiphenyl: 46.9 g (0.2 mol) of 6-chloro-6H- dibenz[c,e][1,2]oxaphos-phorine in 250 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.45 mol of isopropylmagnesium bromide in 300 ml of tetrahydrofuran is added dropwise. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with concentrated sulfuric acid, heated to 80°C and the organic phase is separated off. During cooling, 51.7 g (90%) of colorless solid having melting point 82 to 84°C crystallizes from the aqueous phase. 100 ml of 2N sodium hydroxide solution are added to this solid and the mixture is extracted with toluene. The toluene phase is separated off, washed with water, then dried with sodium sulfate and concentrated ±n vacuo. 38.9 g (68%) of colorless oil are obtained. 31P-NMR (CDCl3): d = 0.3 ppm Example 12 Preparation of 2-[bis-(4-N,N-dimethylaminophenyl)phos~ phino]-2'-hydroxybiphenyl; A solution of 300 mmol of 4-N,N-dimethylaminopnenyj.-magnesium bromide in 150 ml of tetrahydrofuran is introduced, in an argon atmosphere with stirring, and 30.5 g (130 mmol) of 6-chloro-6H-dibenz[c,e]-[l,2]oxaphosphorine in 200 ml of anhydrous o-xylene at 80°C are added dropwise. The temperature increases in the course of this from 80 to 90°C, tetrahydrofuran 24 being distilled off. The mixture is then stirred for 1 hour at 110°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. After crystallization with methanol, 48.0 g (84%) of colorless crystals having melting point 177 to 178°C are obtained, 31P-NMR (CDC13) : d = -15.6 ppm Example 13 Preparation of 2-diphenylphosphino-2'-hydroxy-3'-phenyl-biphenyl: 23.5 g (0.1 mol) of 6-chloro-6H-4-phenyl-dibenz[c,e]-El,2]oxaphosphorine in 120 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.25 mol of phenylmagnesium bromide in 100 ml of diethyl ether is added dropwise. Diethyl ether is distilled off and the temperature slowly increased to 120°C in. the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 40.0 g of colorless viscous oil are obtained. 31P-NMR (CDC13): d= -11,0 ppm Example 14 Preparation of 2-[bis-(4-N,N-diisopropylaminomethyl-phenyl)phosphino] -2' -hydroxybiphenyl: A solution of 300 mmol of 4-(N,N-diisopropylaminomethyl) -phenylmagnesium bromide in 25 150 ml of tetrahydrofuran (THF) is introduced, in an argon atmosphere with stirring, and 30.5 g (130 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorine in 200 ml of anhydrous o-xylene are added dropwise at 80°C. The temperature increases from 80 to 90°C, tetrahydrofuran being distilled off in the course of this. The mixture is then stirred for 5 hours at 120°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. After crystallization with methanol, 63.3 g (84%) of colorless crystals are obtained. 31P-NMR (CDC13): d = -12.7 ppm Example 15 Preparation of 2'-{bis-[3,5-bis-(trifluromethyl)phenyl]-phosphino-phenyl}-2 -hydroxynaphthalene: 6.3 g (22 mmol) of 5-chloro-5H-benzo[c]naphth[X,2-e]-[1,2]oxaphosphorine in 100 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.86 mmol of 3,5-bis(tri-fluoromethyl)-phenylmagnesium bromide in 120 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 4 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. 15.9 g of black solid are obtained. By recrystallization from heptane, with addition of activated carbon, and subsequent hot filtration, 9.5 g (64%) of pale yellow viscous oil are obtained. 27 slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled t 31P-NMR (CDC13): d = -8.0 ppm Example 18 Preparation of 2-[bis-(di-3,5-fluoroph@nyl)phosphino3-2 -hydroxy-3 '-phenylbiphenyl: 11.7 g (0-05 mol) of 6-chloro-6H-4-phenyldibenz[c,el-Cl,23oxaphosphorine in 120 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.125 mol of 3,5-difluorophenylmagnesium bromide in 100 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature, and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. 21.3 g of colorless viscous oil are obtained. 31P-NMR (CDCI3) : d = -7.5 ppxn 26 31P-NMR (CDCl3):d = -9.7 ppm Example 16 Preparation of 2'-[bis-(di~3,5-fluorophenyl)phosphino-phenyl] -2-hydroxynaphthalene: 14.0 g (0.049 mol) of 5-chloro-5H- benzo[c]naphth[l,2-e3-tl,2]oxaphoaphorine in 100 ml of anhydrous o-xylene at 8G°C are introduced, in an argon atmosphere with stirring, and a solution of 0.15 mol of 3,5-difluorophenylmagnesium bromide in 100 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature, and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. 23.3 g of brown oil are obtained. By column chromatography on silica gel using ethyl acetate/n-heptane (2:1) as mobile phase, 13.7 g (59%) of colorless crystals are obtained. 31P-NMR (CDCl3 ): d = -9.0 ppm Example 17 Preparation of 2-{bis-[3,5-bis- (trif luoromethyDphenyl] phosphino}-2' -hydroxy-3' -phenylbiphenyl: 10.0 g (0.032 mol) of 6-chloro-6H-4-phenyldibenz[c,e]-[l,2]oxaphosphorine in 100 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.086 mol of 3,5-bis(trifluoro-methyl)-phenylmagnesium bromide in 100 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature WE CLAIM: 1. A process for the preparation of hydroxybiarylphosphines of the formula in which R , R , a, b, Ar-Ar, R and R have the meaning below, which comprises reacting. an oxaphosphorine of the formula in which Ar-Ar is biphenyl, 1-phenylnaphthyi or 1,1'Hainaphthyl, I 2 R and R are identical or different and are F, Cl, alkyl or alkoxy having in each case I to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the 3 4 3 Ar-Ar bond, with a compound selected from R -Me, R -Me and Me-R - R -Me, 3 4 3 4 in R -Me and R -Me, R and R are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms', alkaryl having 7 to 9 carbon atoms, Ar -(R ) , n 3 S in which Ar is an aryl radical having 6 to 10 cartoon atoms, R is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF , dialkylamino having a total of 2 to 8 carbon atoms or - 3 CH N(alkyl) having 1 to 3 carbon atoms per alkyl and n is an 2 2 integer from 0 to 5, and 1 - 28a - 3 4 3 4 in compound Me-R -R -Me, -R -R - forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated, Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a _ 29 temperature of -40 to a.60°c, then adding water and, optionally, a water-insoluble organic solvent and separating the aqueous phase from the organic phase. 2. The process as claimed in claim 1, wherein an , oxaphosphorine of the formula (IX) is used, in which R1 and R2 are identical or different and are F, Cl, alXyl or alkoxy having in each case 1 to 4 carbon atoms or are substituted or unsubstituted phenyl/ a and b are identical or different and are an integer from 0 to 2, 3. The process as claimed in claim 1 or 2, wherein an oxaphosphorine of the formula (ID is used, in which R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each ease 1 to 4 carbon atoms, a and b are identical or different and are 0 or 1. 4. The process as claimed in one or more of claims l to 3, wherein an oxaphosphorine of the formula (II) is used, in which Ar-Ar is 1-phenylnaphthyl and the Ar-P bond is arranged on the phenyl ring of the i"phenylnaphthyl or on the naphthyl ring of the 3.-phenylnaphthyI, 5. The process as claimed in one or more of claims X to 4, wherein a compound R3-Me or R4-Me is used, in which R3 and R4 are identical or different and are alkyl having X to 4 carbon atoms, cycloalkyl having 4 to 6 carbon atoms, benzyl, &r3-(R5)n, where Ar3 is angry! radical having 6 to 10 carbon atoms and R5 is alkyl or alkoxy having, in each case 1 to 4 ^car-bbn atoms, F, Cl, CF3, dialXylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having l to 3 carbon atoms per alkyl and n is an integer from 0 to 5. 30 6. The process as claimed in one or more of claims 1 to 5, wherein a compound R3-Me and R4-Me is used, in which Me is MgX, where X is chlorine, bromine or iodine or an alkali metal. 7. The process as claimed in one or more of claims 1 to 6, wherein a compound R3-Me and R4-Me is used, in which Me is MgX, where X is chlorine or bromine or lithium. 8. The process as claimed in one or more of claims 1 to 7, wherein the solvent used is a dipolar aprotic or nonpolar solvent or a mixture of these solvents. 9. The process as claimed in one or more of claims 1 to 8, wherein the solvent used is tetrahydrofuran, dioxane, ortho-xylene, meta-xylene, para-xylene, a mixture of isomeric xylenes, toluene, mesitylene, ethylbenzene or mixtures of these solvents. 10. The process as claimed in one or more of claims 1 to 9, wherein the reaction is carried out at a temperature of 40 to 160°C, preferably 60 to 120°C. 11. The process as claimed in one or more of claims 1 to 10, wherein the reaction is carried out in a first stage at -40 to 80, in particular -20 to 60, preferably -10 to 50, °C and is then carried out in a second stage at 20 to 160°C, in particular 40 to 140, preferably 60 to 120, °C. 12. The process as claimed in one or more of claims 1 to 11, wherein toluene, ortho-xylene, meta-xylene, para-xylene, mixtures of isomeric xylenes, mesitylene, ethylbenzene or an ester of an aliphatic carboxylic acid having 1 to 4 carbon atoms and an aliphatic alcohol having 1 to 4 31 carbon atoms or mixtures of these solvents are used as water-insoluble organic solvents. 13- The process as claimed in one or more of claims 1 to 12, wherein the aqueous phase is set to a pH of 3 to 9, in particular 4 to 8, preferably 5 to 7. The present invention relates to a process for the preparation of hydroxybiarylphosphines of the formula in which R1, R2, a, b, Ar-Ar, R3 and R4 have the meaning bel, by reacting an oxaphosphorine of the formula in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the Ar-Ar bond, with a compound R -Me and R4-Me, in which R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or with a compound Me-R -R -Me, in which -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated. Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a temperature of -40 to 160°C, then adding water and, if appropriate, a water-insoluble organic solvent and separating the aqueous phase from the organic phase. The invention further relates to compounds selected from the group consisting of the hydroxybisarylphosphixines.

Full Text

- 1A -
a present invention relates to a process which is improved with respect to the prior art for the preparation of hydroxybiaryl-phosphines and novel compounds of this group as substances. Hydroxybiarylphosphirtes are important intermediates, for example in the synthesis of phospbinophosphite ligands of the formula (A)

The hydroxybiarylphosphines, prepared according to the present invention, are used as starting materials for the preparation of phosphite igands. Such 1igands are used for the preparation of transition metal complexes, which are useful in the preparation of optically active a1dehydes.
The abovementioned phosphinophosphite 1igands are used in enantioselective hydrofarmylation (EP 0614901, EP 0614902, EP 0614903, EP 0614870), By means of ensntioselective hydroforroy-lation, by reacting a suitable olefin with carbon monoxide and hydrogen, optically active aldehydes, for example, can be prepared -
The preparation of the hydroxybiarylphosphines required as intermediates for the preparation of the phosphinophosphite ligands is described in more detail in HP 0614903 and in Tetrahedron Letters, 31, 6321 (19900 and J org Chem 58, .1945 (1993). It starts from dihydroxybiary1 compounds and proceeds via not less than 4 stages, described in more detail by the reaction equations below- Some of these reaction stages are costly and are associated, furthermore, with high expenditure for the necessary purification steps.
iA

2
The reaction proceeds via the following 4 stages:
1st stage

Tf2O: Trifluoromethylsulfonic anhydride 2nd stage

3 3rd stage

4th stage

HSiCl3: Trichlorosilane NEt3: Triethylamine
HSiCl3: Trichlorosilane NEt3: Triethylamine
A further disadvantage of this process is that a disub-stituted phoaphine oxide, that is diphenylphosphine oxide, must be employed in the second stage. However, only a restricted number of suitable disubstituted phosphine oxides are available. This considerably restricts the possibilities of this synthesis.
A further critical disadvantage is the fact that diphenylphosphine oxide reacts at random with one of the two TfO radicals. This reaction is therefore not suitable for specifically substituting one of the two TfO radicals by the diphenylphosphine oxide radical. A mixture of both substitution products always forms. This is a disadvantage, in particular, when unsyrametri-cal dihydroxybiaryl compounds are used, since mixtures

4
form which cannot be separated into the individual components, or can only be separated with a disproportionately high expenditure.
This process is therefore chiefly suitable only for the reaction of symmetrical dihydroxybiaryl compounds in which the two hydroxyl groups are identical in the sense of being indistinguishable. In this case, it does not actually matter which of the two hydroxyl groups or TfO radicals are exchanged for the diphenylphosphine oxide, since an exchange of the one hydroxyl group or of the one TfO radical always leads to the same end product as exchange of the other hydroxyl group or of the other TfO radical.
There is therefore vigorous interest in providing a process for the preparation of hydroxybiarylphosphines which does not have the above described disadvantages, can be implemented industrially without great expense starting from comparatively readily accessible starting materials, does not start from dihydroxybiaryl compounds and is therefore also not restricted to the reaction of symmetrical dihydroxybiaryl compounds.
This object is achieved by a process for the preparation of hydroxybiarylphosphines of the formula

in which R1, R2, a, b, Ar-Ar, R3 and R4 have the meaning below. It comprises reacting an oxaphosphorine of the formula
in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1*-binaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 car-

5
bon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-O bond are each arranged in the ortho-position to the Ar-Ar bond, with a compound R3-Me and R4-Me, in which R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialfcylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or with a compound Me-R3-R4-Me, in which -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated. Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a temperature of -40 to 160°C, then adding water and, if appropriate, a water-insoluble organic solvent and separating the aqueous phase from the organic phase.
The reaction proceeds, as described for example by the equation below, with cleavage of the P ring in the oxa-phosphorine (II):

It is to be considered as highly surprising that it is possible using the process of the invention to open the phosphorus-containing ring in the oxaphosphorine of the formula (II) with very high selectivity, not only the Ar-Ar bond, but also at the same time the Ar-P bond remaining unchanged.

6
This ensures that even when unsymmetrical oxaphosphorines are used, a uniform hydroxy-biarylphosphine is always formed and not a mixture containing various hydroxybiarylphosphines and other byproducts and breakdown products.
Furthermore/ the process of the invention permits the phosphorus atom to be specifically substituted either by two identical radicals or by two different radicals.
The process of the invention, moreover, starts from comparatively readily accessible oxaphosphorines of the formula (II) whose preparation is subject-matter of a German patent application (File number: 195 21 339.4) filed on the same day as the present patent application.
A further advantage of the process of the invention is that it is not necessary to isolate one of the intermediates between the individual working steps in order then to process this further.
In order to illustrate which oxaphosphorines of the formula (II) can be used, the following compounds of the formulae (IIIa), (IV), (IV), (IVa) and (V) may be mentioned, but without making in this case any claim as to completeness of the enumeration.
The oxaphosphorines of the formula (III)

are derived from 6-chloro-6H-dibenz[c,e][l,2]oxa-
phosphorine or 6-bromo-6H-
dibenz[c,e][l,2]oxaphosphorine. The oxaphosphorine of

7 the formula (IlIa)

is 6-chloro-6H-4-phenyldibenz[c,e][1,2]oxaphosphorine or 6-bromo-6H-4-phenyldibenztc,e][1,2]oxaphosphorine. The oxaphosphorines of the formula (IV) containing a 1-phenylnaphthyl radical as Ar-Ar

are derived from 6-chloro-6H-benzo[e]naphth[2,1-c][1,2]oxaphosphorine or 6-bromo-6H-benzo[e]naphth[2,1-c][1,2]oxaphosphorine and the oxaphosphorines of the formula (IVa) similarly containing a 1-phenylnaphthyl radical as Ar-Ar

are derived from 5-chloro-5H-benzo[c]naphth[1,2-
c][1,2]oxaphosphorine or 5-bromo-5H-benzo[c]naphth[l,2-
c][1,2]oxaphosphorine.
The oxaphosphorines of the formula (V) containing a

8
binaphthyl radical as Ar-Ar

are derived from 3-chloro-3H-dinaphtho[2,l-c:l',2'-e]-[1,2]oxaphosphorine or 3-bromo-3H-dinaphtho-[2,lc:l' ,2' -e][1,2]oxaphosphorine.
It is understood that, in the abovementioned formulae, R1, R2, a and b have the meaning already given.
Compounds of particular interest are oxaphosphorines of the formula (II) in which R1 and R2 have the meaning mentioned above and a is 0 and b is 1 or a is 1 and b is 0. These oxaphosphorines are relatively readily accessible, since they only have one radical R1 and R2, and at the same time they are unsymmetrical. Particular preference is to be given to oxaphosphorines of the formula (II) in which a and b are each 0.
The process of the invention can be carried out with great success by using an oxaphosphorine of the formula (II) , in which R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 4 carbon atoms or are substituted or unsubstituted phe-nyl, a and b are identical or different and are an integer from 0 to 2, in particular a is 0 and b is 1 or a is 1 and b is 0, and by using, in particular, an oxaphosphorine of the formula (II), in which R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 4 carbon atoms, a and b are identical or different and are 0 or 1, in particular a and b are different and are 0 or 1.
According to a process variant, an oxaphosphorine of the formula (II) is used, in which Ar-Ar is

9
1-phenylnaphthyl and the Ar-P bond is arranged on the phenyl ring of the 1-phenylnaphthyl or on the naphthyl ring of the 1-phenylnaphthyl. These oxaphosphorines can, as already described by the compounds of the formulae (IV) and (IVa), be substituted by (R1)a and (R1)b, oxaphosphorines of this type, in which a is 0 and b is 1 or a is 1 and b is zero or in which a and b are each zero, because of their relatively good availability, achieving particular interest.
As compounds R3-Me and/or R4-Me or Me-R3-R4-Me, in which R -R4 are joined together and form a chain having 3 to 5 carbon atoms and the chain can be substituted or unsubstituted, in particular one or two aromatic rings or ring systems each having 6 to 10 carbon atoms can be anellated to the chain, use can generally be made of organometallic compounds. Me is, for example, MgX, where X is chlorine, bromine or iodine, in particular chlorine or bromine, or an alkali metal, for example lithium, sodium or potassium, in particular sodium or lithium, preferably lithium.
The reaction is carried out in the presence of a solvent. It is advisable to use as solvent a dipolar aprotic solvent or a nonpolar solvent or a mixture of these solvents.
In this context, it may be noted that organometallic compounds are usually handled in specific solvents. Grignard compounds are frequently used dissolved or suspended in an ether.
The solvents used can be, without making any claim as to the completeness, an ether or an ether mixture, for example dialkyl ether having 2 to 4 carbon atoms per alkyl, tetrahydrofuran, dioxane, toluene, ortho-xylene, meta-xylene, para-xylene, a mixture of isomeric xylenes, mesitylene, ethylbenzene or mixtures of these solvents.
The reaction is presumed to proceed in two stages, one

10
equivalent of the organometallic compound first reacting with the oxaphosphorine. In this case, the X on the P atom in the oxaphosphorine of the formula (II) is probably substituted.
In a subsequent stage, a further equivalent of the organometallic compounds reacts with the previously-substituted P atom of the oxaphosphorine, the ring probably being opened by cleavage of the P-0 bond.
Utilizing this reaction sequence, the oxaphosphorine of the formula (II) can first be reacted with the compound R -Me and then with the compound R4-Me or, vice versa, the oxaphosphorine of the formula (II) can first be reacted with the compound R4-Me and then with the compound R3-Me.
By this means, hydroxybiarylphosphines of the formula I are obtained in a simple manner whose P atom, because of the substitution by two different radicals R3 and R4, has in total three different radicals, that is the hydroxybiaryl radical, the radical R3 and the radical R4.
This reaction sequence can of course also be applied to the reaction of the compound Me-R3-R4-Me, the phosphorus atom being incorporated into a ring.
In most cases it is sufficient to carry out the reaction at a temperature of 40 to 160°C, in particular 60 to 120°C. This relates to the entire reaction sequence, that is both stages.
However, the reaction can also be allowed to proceed in a first stage at -40 to 80, in particular -20 to 60, preferably -10 to 50, °C and then in a second stage at 20 to 160, in particular 40 to 140, preferably 60 to 120, °C.
The reaction conditions also depend to a certain extent on the type of organometallic compound used.

11
Organometallic compounds having a high reactivity/ for example alkyl-Grignard compounds or alkali metal alkyls, can be reacted even at very low temperatures, whereas less reactive organometallic compounds, for example aryl-Grignard compounds, necessitate higher reaction temperatures.
However, the reaction conditions also depend to a certain extent on the type of the oxaphosphorine used. Oxaphosphorines of the formula (II) having elevated reactivity can be reacted at lower temperatures. These may include oxaphosphorines whose P-containing ring is under stress, for example owing to twisting of the two aryl radicals with respect to each other about the Ar-Ar bond. Oxaphosphorines whose p-containing ring has no stress, or only low stress, or oxaphosphorines whose P atom is sterically hindered owing to bulky substituents and is not freely accessible to an attack by the organometallic compound can, in contrast, make a reaction at elevated temperatures necessary.
Usually, a solution of the oxaphosphorine of the formula (II) is introduced, one of the abovementioned solvents being able to be used. A solution or suspension of the organometallic compound R3-Me, R4-Me or Me-R3-R4-Me is added dropwise with stirring to this solution. The organometallic compound is used in the stoichiometrically required amount or in a stoichiometric excess.
In the first reaction stage, 1.0 to 1.5, in particular 1.0 to 1.3, mol of the organometallic compounds R3-He or R4-Me or Me-R3-R4-Me are added per mol of oxaphosphorine of the formula (II), and in the second reaction stage, 1.0 to 1.5, in particular 1.0 to 1.3, mol of the organometallic compounds R3-Me or R4-Me are added per mol of oxaphosphorine of the formula (II)o
The reaction proceeds in the absence of water, due to the use of the water-sensitive organometallic

12
compounds. It Is advisable to allow the reaction to proceed under a protective gas atmosphere, for example under anhydrous N2 or argon.
The procedure can alternatively be performed the other way round and the solution or suspension of the organo-metallic compound can be introduced and the oxaphos-phorine or the solution of the oxaphosphorine can be added with stirring.
After completion of the reaction, the reaction mixture is cooled, if a high reaction temperature should make this necessary, and water is added. The addition of water is necessary in order to hydrolyse any organometallic compounds still present and to hydrolyse the products formed due to the reaction.
In order to promote or induce the phase separation, a water-insoluble organic solvent can be added to the reaction mixture. Usually, toluene, ortho-xylene, meta-xylene, para-xylene, mixtures of isomeric xylenes, mesitylene, ethylbenzene, esters which are derived from a carboxylic acid, in particular an aliphatic carboxylic acid having 1 to 8, in particular 1 to 4, carbon atoms and an aliphatic alcohol having 1 to 8, in particular 1 to 4, carbon atoms, for example ethyl, propyl or butyl acetate, are suitable for use as water-insoluble organic solvent.
In some cases, it can be useful to adjust the reaction mixture or the aqueous phase contained therein to a pH
13
The hydroxybiarylphosphines of the formula (I) are usually further purified by crystallization.
The process of the invention may be carried out continuously or discontinuously, particularly simply discon-tinuously. It may be carried out at superatmospheric pressure, atmospheric pressure or reduced pressure, particularly simply under the reaction pressure which establishes itself.
The present invention further relates to novel hydroxybiarylphosphines of the formula I

in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, in particular 1-phenylnaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the Ar-Ar bond, R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl) 2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated, and, together with the P atom, forms a ring having 4 to 6 members, with the proviso that Ar3-(R5)n is not phenyl or a phenyl substituted by halogen, alkyl or alkoxy each having 1 to 8 carbon atoms, if Ar-Ar is biphenyl or 1,1'-binaphthyl and R3 and R4 are identical in each

14 case.
The invention relates in particular to hydroxybiaryl-phosphines of the formula (I), in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1-binaphthyl, in particular 1-phenylnaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 4 carbon atoms or substituted or unsubstituted phenyl, a and b are identical or different and are an integer from 0 to 2, in particular 0 or 1.
The invention further relates to
hydroxybiarylphosphines of the formula (I), in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, in particular 1-phenylnaphthyl, R3 and R4 are identical or different and are alkyl having 1 to 4 carbon atoms, cycloalkyl having 4 to 6 carbon atoms, benzyl, Ar3-(R5), where Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 4 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl) 2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, with the proviso that Ar3-(R5)n is not phenyl or a phenyl substituted by halogen, alkyl or alkoxy having in each case 1 to 8 carbon atoms, if Ar-Ar is biphenyl or 1.1'-binaphthyl and R3 and R4 are identical.
In the event that Ar-Ar is 1-phenylnaphthyl, a feature of the novel hydroxybiarylphosphines is that the radical -PR3R4 is arranged either on the phenyl ring of the 1-phenylnaphthyl or on the naphthyl ring of the 1-phenylnaphthyl.
Without making any claim as to completeness, tne following substances may be mentioned as novel compounds:
2-diphenylphosphino~l"(2-hydroxyphenyl)naphthalene

15
2-dicyclohexylphosphi-no-1- (2-hydroxyphenyl)naphthalene 2-bis-(4-fluorophenyl)phosphino-l-(2-hydroxyphenyl)-naphthalene
2-bis-(2-methoxyphenyl)phosphino-l-(2-hydroxyphenyl)-
naphthalene
2-bis-(2-methylphenyl)phosphino-l-(2-hydroxyphenyl)-
naphtha1ene
2-(4-fluorophenyl-phenyl)phosphino-l-(2 -hydroxyphenyl)-
naphthalene
2-(2-methoxyphenyl-phenyl)phosphino-l-(2-
hydroxypheny1)-naphthalene
1-[2-(diphenylphosphino)phenyl]-2-hydroxynaphthalene
1-[2-(dicyclohexylphosphino)phenyl]-2-
hydroxynaphthalene
l-{2- [bis-(4-fluorophenyl)phosphino]phenyl}-2-hydroxy-
naphthalene
1-[2-(4-fluorophenyl-phenyl)phosphino-phenyl]-2-
hydroxynaphthalene
1-[2-(2-methoxyphenyl-phenyl)phosphino-phenyl]-2-
hydroxynaphthalene
2-(diisopropyl)phosphino-l-(2-hydroxyphenyl)naphthalene
2-[Bis-(4-N,N-dimethylaminophenyl)phosphino]-1-(2-
hydroxyphenyl)naphthalene
2-[bis-(4-N,N-diisopropylaminomethylphenyl)phosphino]-
1-(2-hydroxyphenyl)naphthalene
2-{bis-[3,5-bis-(trifIuoromethyl)phenyl]phosphino}-1-
(2-hydroxyphenyl)naphthalene
1-[2-(diisopropylphosphino)phenyl]-2-hydroxynaphthalene
l-{2-[bis-(4-N,N-dimethylaminophenyl)phosphino]phenyl}-
2-hydroxynaphthalene
l-{2-[bis-(4-N,N-
diisopropylaminomethylphenyl)phosphino]phenyl}-2-
hydroxynaphthalene
l-{2-{bis- [3, 5-bis- (trif luoromethyl)phenyl] phosphino}-
phenyl}-2-hydroxynaphthalene

16
2 ' -hydroxy-2 - [2 -methoxyphenyl (phenyl) phosphinol biphenyl
2'-hydroxy-2-[isopropyl{phenyl)phosphinojbiphenyl
2'-hydroxy-2-[cyclohexyl(phenyl)phoaphino3 biphenyl
2-{bis-[3,5-bis-(trifluoromethyl)phenyl}phosphino}-2'-
hydroxybipheny1
2-diisopropylphosphino-2'-hydroxybiphenyl
2- [bia- (4-N,N-dimethylaminophenyl)phosphino3 -2' -
hydroxy-biphenyl
2- [bis- (4-N,H-diisopropylaminomethylphenyl)phosphino3 -
2' -hydroxybiphenyl
2-diphenylphosphino-2'-hydroxy-3'-phenylbiphenyl
2'-hydroxy-2-[2-methoxyphenyl(phenyl)phoaphino]-1,1'-
biphenyl
2-{bis-[3,5-bis-(trifluoromethyl)phenyl]phosphino}-2'-
hydroxy-1,1'-binaphthyl
2-diisopropylphosphino-2'-hydroxy-l,l'-binaphthyl
2-[bis-(4-N/N-dimethylaminophenyl)phosphino]-2'-
hydroxy-1,1'-binaphthyl
2-[bis-(4-N,N-diisopropylaminomethylphenyl)phosphino3-
2'-hydroxy-1,1'-binaphthyl
2'-hydroxy-2-[(isopropylpheny1)phosphino]-1,1'-
binaphthyl
2' -hydroxy-2-[(cyclohexylphenyl)phosphino]-1,1*-
binaphthyl
The following examples describe the invention in more detail without restricting it thereto.
Experimental part
Example 1
Preparation of 2' -hydroxy-2-diphenylphosphinobiphenyls
12.3 g (52.4 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxa-phosphorizxe in 80 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and 66 ml of a 2M solution of phenylmagnesium bromide in

17
tetrahydrofuran are added dropwise. The temperature increases in the course of this from 25 to 40°C- The mixture is then stirred for 4 hours at 65°C, cooled to room temperature and loo ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 19.0 g of colorless oil are obtained. By crystallization with aethanol/water, 10:1, 18.1 g (98%) of colorless crystals having melting point 123 to 124°C are obtained.
31P-NMR (CDC13): d = -11.7 ppm Example 2
2l-Hydroxy-2-(bis-(3-fluorophenyl)phosphino]biphenyl:
16.4 g (70 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxa-phosphorine in 80 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and a 2M solution of 140 mmol of 3-fluorophenylmagnesium bromide in tetrahydrofuran is added dropwise. The temperature increases in the course of this from as to 45°C. The mixture is then stirred for 12 hours at 65°C, cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid/ the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 25.8 g of colorless oil are obtained. By crystallisation with methanol/water, 10:1, 19.8 g (71%) of colorless crystals having melting point 161 to 163°C are obtained.
31P-NMR (CDCI3): d = -11.0 ppm

18 Example 3
Preparation of 2'-hydroxy-2-[bis(1-naphthyl)phosphinoj-biphenyl:
14.1 g (60 mmol) of 6-chloro-6H-dibenz[c,e] [1,2]-oxaphosphorine in 50 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and a solution of 150 mmol of l-naphthylmagnesium bromide in tetrahydrofuran is added dropwise. The temperature increases in the course of this from 25 to 45°c. The mixture is then stirred for 3 hours at 80°C and 5 hours at 12O°C The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 19.0 g of colorless oil are obtained. By crystallization with methanol/water, 10:1, 22.8 g (89%) of colorless crystals having melting point 255 to 256°C are obtained.
31P-NMR (CDC13): d = -30.3 ppm Example 4
Preparation of 2'-hydroxy-2-[(2-methoxypheny1-phenyl)phosphino]biphenyl:
23.5 g (100 mmol) of 6-chloro-6H-dibenz[c,e][l,2]oxa-phosphorine in 50 ml of anhydrous tetrahydrofuran are introduced, in an argon atmosphere with stirring, and a solution of 100 mmol of 2-methoxyphenylmagnesium bromide in tetrahydrofuran is added dropwise at -10°C. The mixture is slowly heated to 25°C and stirred for 3 hours. A solution of 100 mmol of phenylmagnesium bromide in 150 ml of tetrahydrofuran is added dropwise and the mixture is then stirred for 5 hours at 65°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute

19
hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 38.0 g of colorless oil are obtained. By crystallization with methanol/water, 10:1, 32.7 g (86%) of colorless crystals having melting point 137 to 139°C are obtained.
31P-NMR (CDC13) : d = -22.0 and -23.2 ppm (diastereomer ratio 30:70)
Example 5
Preparation of 2'-hydroxy-2-[(2-tolyl-phenyl)-phosphino]biphenyl:
16.4 g (70 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxa-phosphorine in 50 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and a solution of 70 mmol of 2-tolylmagnesium bromide in tetrahydrofuran are added dropwise at -10°C. The mixture is slowly heated to 2 5°C and stirred for 3 hours. A solution of 70 mmol of phenylmagnesium bromide in 50 ml of diethyl ether is added dropwise and the mixture is then heated to 65°C, the diethyl ether being distilled off. The mixture is stirred for a further 2 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 25.8 g of colorless crystals are obtained. By recrystallization from methanol/water, 10:1, 20.4 g (79%) of colorless crystals having melting point 98 at 101°C are obtained.
31P-NMR (CDCI3) : d = -19.7 and -20.2 ppm (diastereomer ratio 50:50)

20 Example 6
Preparation of 1- (2-hydroxyphenyl) -2-diphenylphosphino-naphthalene:
50.8 g (178 mmol) of 6-chloro-6H-benzo[c]naphth[2,i-c]-[l,2]oxaphosphorine in 250 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and 390 ml of a 2M solution of phenylmagnesium bromide in diethyl ether are added dropwise. The temperature increases in the course of this from 25 to 40°C. The mixture is then slowly heated to 100°C, the diethyl ether distilling off, and is stirred for 3 hours. The mixture is cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sul-fate and concentrated under reduced pressure. 70 g of colorless oil are obtained. By crystallization with methanol, 63.8 g (89%) of colorless crystals having melting point 104 to 106°C are obtained.
31P-NMR (CDC13) : d = -12.0 ppm Example 7
Preparation of 1-(2-diphenylphosphinophenyl)-2-hydroxy-naphthalene
9.5 g (33.5 mmol) of 5-chloro-5H-benzo[c]naphth[l,2-e]-[1,2]-oxaphosphorine in 50 ml of anhydrous o-xylene are introduced, in an argon atmosphere with stirring, and 28 ml of a solution of 84 mmol of phenylmagnesium bromide in diethyl ether are added dropwise. The temperature increases in the course of this from 25 to 40°C. The mixture is then slowly heated to 100°C, the diethyl ether distilling off, and is stirred for 3 hours. The mixture is cooled to room temperature and 100 ml of water and 100 ml of ethyl acetate are added. The mix-

21
ture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sul-fate and concentrated under reduced pressure. 13.5 g of colorless oil are obtained. By crystallization with methanol, 9.5 g (70%) of colorless crystals having melting point 135 to 138°C are obtained.
31P-NMR (CDC13): d = -12.7 ppm Example 8
Preparation of 2- [bis- (3-fluorophenyDphosphino] -1- (2-hydroxyphenyl)naphthalene:
8.5 g (30 mmol) of 5-chloro-5H-benzo[c]naphth[1,2-e]-[1,2]-oxa-phosphorine in 50 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 70 mmol of 3-fluorophenyl-magnesium bromide in 80 ml of o-xylene is added dropwise. The temperature increases in the course of this from 80 to 90°C. The mixture is then stirred for 1 hour at 110°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 19.0 g of colorless oil are obtained.
31P-NMR (CDCI3): d = -3.8 ppm Example 9
Preparation of 2-(dibenzophosphol-9-yl)-2'-hydroxy-biphenyl:
46 ml of a 1.6 M solution of butyllithium in hexane are added dropwise to a solution of 11.4 g (36.54 mmol) of 2,2'-dibromobiphenyl in 60 ml of diethyl ether. The mixture is then stirred for 24 hours at 20°C. To this

22
is then added, at 0°C, a solution of 8.6 g (36.5 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorine in 30 ml of o-xylene. The mixture is then stirred for a further 2 hours at 25°C and 3 hours at 50°C. The mixture is cooled to room temperature and 100 ml of water are carefully added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. By crystallization of the residue with 2-butanone, 11.8 g (90%) of colorless crystals having melting point 152 to 155°C are obtained.
31P-NMR (CDC13) : d = -17.8 ppm Example 10
2-{Bis-[3,5-bis-(trifluoromethyl)phenyl]phosphino}-2'-hydroxybiphenyl:
23.5 g (0.1 mol) of 6-chloro-6H-
dibenz[c,e][1,2]oxaphosphorine in 200 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.23 mol of 3,5-di{trifluoromethyl)phenyl-magnesium bromide in 300 ml of tetrahydrofuran is added dropwise. Tetrahydrofuran is distilled off and the temperature is slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature, and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 61.0 g of black solid are obtained. By recrystallization from heptane, with addition of activated carbon, and subsequent hot filtration, 37.2 g (59%) of pale yellow crystals having melting point 120 to 121°C are obtained.
31P-NMR (CDC13): d = -8.4 ppm

23
Example 11
Preparation of 2-diisopropylphosphino~2'-hydroxybiphenyl:
46.9 g (0.2 mol) of 6-chloro-6H-
dibenz[c,e][1,2]oxaphos-phorine in 250 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.45 mol of isopropylmagnesium bromide in 300 ml of tetrahydrofuran is added dropwise. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with concentrated sulfuric acid, heated to 80°C and the organic phase is separated off. During cooling, 51.7 g (90%) of colorless solid having melting point 82 to 84°C crystallizes from the aqueous phase. 100 ml of 2N sodium hydroxide solution are added to this solid and the mixture is extracted with toluene. The toluene phase is separated off, washed with water, then dried with sodium sulfate and concentrated ±n vacuo. 38.9 g (68%) of colorless oil are obtained.
31P-NMR (CDCl3): d = 0.3 ppm Example 12
Preparation of 2-[bis-(4-N,N-dimethylaminophenyl)phos~ phino]-2'-hydroxybiphenyl;
A solution of 300 mmol of 4-N,N-dimethylaminopnenyj.-magnesium bromide in 150 ml of tetrahydrofuran is introduced, in an argon atmosphere with stirring, and 30.5 g (130 mmol) of 6-chloro-6H-dibenz[c,e]-[l,2]oxaphosphorine in 200 ml of anhydrous o-xylene at 80°C are added dropwise. The temperature increases in the course of this from 80 to 90°C, tetrahydrofuran

24
being distilled off. The mixture is then stirred for 1 hour at 110°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. After crystallization with methanol, 48.0 g (84%) of colorless crystals having melting point 177 to 178°C are obtained,
31P-NMR (CDC13) : d = -15.6 ppm Example 13
Preparation of 2-diphenylphosphino-2'-hydroxy-3'-phenyl-biphenyl:
23.5 g (0.1 mol) of 6-chloro-6H-4-phenyl-dibenz[c,e]-El,2]oxaphosphorine in 120 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.25 mol of phenylmagnesium bromide in 100 ml of diethyl ether is added dropwise. Diethyl ether is distilled off and the temperature slowly increased to 120°C in. the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated under reduced pressure. 40.0 g of colorless viscous oil are obtained.
31P-NMR (CDC13): d= -11,0 ppm Example 14
Preparation of 2-[bis-(4-N,N-diisopropylaminomethyl-phenyl)phosphino] -2' -hydroxybiphenyl:
A solution of 300 mmol of 4-(N,N-diisopropylaminomethyl) -phenylmagnesium bromide in

25
150 ml of tetrahydrofuran (THF) is introduced, in an argon atmosphere with stirring, and 30.5 g (130 mmol) of 6-chloro-6H-dibenz[c,e][1,2]oxaphosphorine in 200 ml of anhydrous o-xylene are added dropwise at 80°C. The temperature increases from 80 to 90°C, tetrahydrofuran being distilled off in the course of this. The mixture is then stirred for 5 hours at 120°C. The mixture is cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. After crystallization with methanol, 63.3 g (84%) of colorless crystals are obtained.
31P-NMR (CDC13): d = -12.7 ppm Example 15
Preparation of 2'-{bis-[3,5-bis-(trifluromethyl)phenyl]-phosphino-phenyl}-2 -hydroxynaphthalene:
6.3 g (22 mmol) of 5-chloro-5H-benzo[c]naphth[X,2-e]-[1,2]oxaphosphorine in 100 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.86 mmol of 3,5-bis(tri-fluoromethyl)-phenylmagnesium bromide in 120 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 4 hours at 120°C, cooled to room temperature and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. 15.9 g of black solid are obtained. By recrystallization from heptane, with addition of activated carbon, and subsequent hot filtration, 9.5 g (64%) of pale yellow viscous oil are obtained.

27
slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled t 31P-NMR (CDC13): d = -8.0 ppm Example 18
Preparation of 2-[bis-(di-3,5-fluoroph@nyl)phosphino3-2 *-hydroxy-3 '-phenylbiphenyl:
11.7 g (0-05 mol) of 6-chloro-6H-4-phenyldibenz[c,el-Cl,23oxaphosphorine in 120 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.125 mol of 3,5-difluorophenylmagnesium bromide in 100 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature, and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. 21.3 g of colorless viscous oil are obtained.
31P-NMR (CDCI3) : d = -7.5 ppxn

26 31P-NMR (CDCl3):d = -9.7 ppm
Example 16
Preparation of 2'-[bis-(di~3,5-fluorophenyl)phosphino-phenyl] -2-hydroxynaphthalene:
14.0 g (0.049 mol) of 5-chloro-5H-
benzo[c]naphth[l,2-e3-tl,2]oxaphoaphorine in 100 ml of anhydrous o-xylene at 8G°C are introduced, in an argon atmosphere with stirring, and a solution of 0.15 mol of 3,5-difluorophenylmagnesium bromide in 100 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature slowly increased to 120°C in the course of this. The mixture is then stirred for 3 hours at 120°C, cooled to room temperature, and 100 ml of water are added. The mixture is neutralized with dilute hydrochloric acid, the organic phase is separated off, dried with sodium sulfate and concentrated in vacuo. 23.3 g of brown oil are obtained. By column chromatography on silica gel using ethyl acetate/n-heptane (2:1) as mobile phase, 13.7 g (59%) of colorless crystals are obtained.
31P-NMR (CDCl3 ): d = -9.0 ppm Example 17
Preparation of 2-{bis-[3,5-bis-
(trif luoromethyDphenyl] phosphino}-2' -hydroxy-3' -phenylbiphenyl:
10.0 g (0.032 mol) of 6-chloro-6H-4-phenyldibenz[c,e]-[l,2]oxaphosphorine in 100 ml of anhydrous o-xylene at 80°C are introduced, in an argon atmosphere with stirring, and a solution of 0.086 mol of 3,5-bis(trifluoro-methyl)-phenylmagnesium bromide in 100 ml of tetrahydrofuran is added dropwise to this. Tetrahydrofuran is distilled off and the temperature

WE CLAIM:
1. A process for the preparation of hydroxybiarylphosphines of the formula

in which R , R , a, b, Ar-Ar, R and R have the meaning below, which comprises reacting. an oxaphosphorine of the formula
in which Ar-Ar is biphenyl, 1-phenylnaphthyi or 1,1'Hainaphthyl,
I 2 R and R are identical or different and are F, Cl, alkyl or
alkoxy having in each case I to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P
and the Ar-0 bond are each arranged in the ortho-position to the
3 4 3
Ar-Ar bond, with a compound selected from R -Me, R -Me and Me-R -
R -Me,
3 4 3 4 in R -Me and R -Me, R and R are identical or different
and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to *
10 carbon atoms', alkaryl having 7 to 9 carbon atoms, Ar -(R ) ,
n
3 S
in which Ar is an aryl radical having 6 to 10 cartoon atoms, R
is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F,
Cl, CF , dialkylamino having a total of 2 to 8 carbon atoms or -
3 CH N(alkyl) having 1 to 3 carbon atoms per alkyl and n is an
2 2
integer from 0 to 5, and
1

- 28a -
3 4 3 4 in compound Me-R -R -Me, -R -R - forms a chain of 3 to 5 members
to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated, Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a _

29
temperature of -40 to a.60°c, then adding water and, optionally, a water-insoluble organic solvent and separating the aqueous phase from the organic phase.
2. The process as claimed in claim 1, wherein an ,
oxaphosphorine of the formula (IX) is used, in
which R1 and R2 are identical or different and are
F, Cl, alXyl or alkoxy having in each case 1 to 4
carbon atoms or are substituted or unsubstituted
phenyl/ a and b are identical or different and are
an integer from 0 to 2,
3. The process as claimed in claim 1 or 2, wherein an
oxaphosphorine of the formula (ID is used, in
which R1 and R2 are identical or different and are
F, Cl, alkyl or alkoxy having in each ease 1 to 4
carbon atoms, a and b are identical or different
and are 0 or 1.
4. The process as claimed in one or more of claims l
to 3, wherein an oxaphosphorine of the formula
(II) is used, in which Ar-Ar is 1-phenylnaphthyl
and the Ar-P bond is arranged on the phenyl ring
of the i"phenylnaphthyl or on the naphthyl ring of
the 3.-phenylnaphthyI,
5. The process as claimed in one or more of claims X to 4, wherein a compound R3-Me or R4-Me is used, in which R3 and R4 are identical or different and are alkyl having X to 4 carbon atoms, cycloalkyl having 4 to 6 carbon atoms, benzyl, &r3-(R5)n,
where Ar3 is angry! radical having 6 to 10 carbon atoms and R5 is alkyl or alkoxy having, in each case 1 to 4 ^car-bbn atoms, F, Cl, CF3, dialXylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having l to 3 carbon atoms per alkyl and n is an integer from 0 to 5.

30
6. The process as claimed in one or more of claims 1
to 5, wherein a compound R3-Me and R4-Me is used,
in which Me is MgX, where X is chlorine, bromine
or iodine or an alkali metal.
7. The process as claimed in one or more of claims 1
to 6, wherein a compound R3-Me and R4-Me is used,
in which Me is MgX, where X is chlorine or bromine
or lithium.
8. The process as claimed in one or more of claims 1
to 7, wherein the solvent used is a dipolar
aprotic or nonpolar solvent or a mixture of these
solvents.
9. The process as claimed in one or more of claims 1
to 8, wherein the solvent used is tetrahydrofuran,
dioxane, ortho-xylene, meta-xylene, para-xylene, a
mixture of isomeric xylenes, toluene, mesitylene,
ethylbenzene or mixtures of these solvents.
10. The process as claimed in one or more of claims 1
to 9, wherein the reaction is carried out at a
temperature of 40 to 160°C, preferably 60 to
120°C.
11. The process as claimed in one or more of claims 1
to 10, wherein the reaction is carried out in a
first stage at -40 to 80, in particular -20 to 60,
preferably -10 to 50, °C and is then carried out
in a second stage at 20 to 160°C, in particular 40
to 140, preferably 60 to 120, °C.
12. The process as claimed in one or more of claims 1
to 11, wherein toluene, ortho-xylene, meta-xylene,
para-xylene, mixtures of isomeric xylenes,
mesitylene, ethylbenzene or an ester of an
aliphatic carboxylic acid having 1 to 4 carbon
atoms and an aliphatic alcohol having 1 to 4

31
carbon atoms or mixtures of these solvents are used as water-insoluble organic solvents.
13- The process as claimed in one or more of claims 1 to 12,
wherein the aqueous phase is set to a pH of 3 to 9, in particular 4 to 8, preferably 5 to 7.
The present invention relates to a process for the preparation of hydroxybiarylphosphines of the formula
in which R1, R2, a, b, Ar-Ar, R3 and R4 have the meaning bel, by reacting an oxaphosphorine of the formula

in which Ar-Ar is biphenyl, 1-phenylnaphthyl or 1,1'-binaphthyl, R1 and R2 are identical or different and are F, Cl, alkyl or alkoxy having in each case 1 to 8 carbon atoms or are substituted or unsubstituted aryl, a and b are identical or different and are an integer from 0 to 4, X in each case is Cl or Br and the Ar-P and the Ar-0 bond are each arranged in the ortho-position to the Ar-Ar bond, with a compound R -Me and R4-Me, in which R3 and R4 are identical or different and are alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 10 carbon atoms, alkaryl having 7 to 9 carbon atoms, Ar3-(R5)n, in which Ar3 is an aryl radical having 6 to 10 carbon atoms, R5 is alkyl or alkoxy having in each case 1 to 8 carbon atoms, F, Cl, CF3, dialkylamino having a total of 2 to 8 carbon atoms or -CH2N(alkyl)2 having 1 to 3 carbon atoms per alkyl and n is an integer from 0 to 5, or with a compound Me-R -R -Me, in which -R3-R4- forms a chain of 3 to 5 members to which one or two aromatic rings or ring systems having 6 to 10 carbon atoms are optionally anellated. Me is a monovalent metal or one equivalent of a polyvalent metal, in the presence of a solvent at a temperature of -40 to 160°C, then adding water and, if appropriate, a water-insoluble organic solvent and separating the aqueous phase from the organic phase.

The invention further relates to compounds selected from the group consisting of the hydroxybisarylphosphixines.

Documents:

00791-cal-1996-abstract.pdf

00791-cal-1996-assignment.pdf

00791-cal-1996-claims.pdf

00791-cal-1996-correspondence.pdf

00791-cal-1996-description(complete).pdf

00791-cal-1996-form-1.pdf

00791-cal-1996-form-2.pdf

00791-cal-1996-form-3.pdf

00791-cal-1996-form-5.pdf

00791-cal-1996-form-6.pdf

00791-cal-1996-g.p.a.pdf

00791-cal-1996-letters patent.pdf

00791-cal-1996-priority document others.pdf

00791-cal-1996-priority document.pdf

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Patent Number

188603

Indian Patent Application Number

791/CAL/1996

PG Journal Number

25/2007

Publication Date

22-Jun-2007

Grant Date

22-Jun-2007

Date of Filing

01-May-1996

Name of Patentee

CLARIANT GMBH

Applicant Address

BRUENINGSTRASSE 50, 65929 FRANKFURT AM MAIN, GERMANY

Inventors:

#	Inventor's Name	Inventor's Address
1	REGNAT DR DIETER	POMMENRING 10.1, D-65817 EPPSTEIN, GERMANY
2	KLEINER DR HANS-JERG	ALTKONIGSTRASSE 11A, D-61476 KRONBERG, GERMANY

PCT International Classification Number

C 07 F 9/12, 9/02

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	19521340.8	1995-06-12	Germany