Indian Patents. 258836:"CATALYST PRECURSOR FOR THE PRODUCTION OF OLEFINS WITH AN ODD NUMBER OF CARBON ATOMS, PROCESS FOR ITS PREPARATION AND PRODUCTION METHOD FOR SUCH OLEFINS"

Title of Invention	"CATALYST PRECURSOR FOR THE PRODUCTION OF OLEFINS WITH AN ODD NUMBER OF CARBON ATOMS, PROCESS FOR ITS PREPARATION AND PRODUCTION METHOD FOR SUCH OLEFINS"
Abstract	The present invention relates to a catalyst precursor for the production of odd olefins having the formula (I), wherein X and Y are halogen and n is 2 or 3; and to a process for its preparation and a method for oligomerization of ethylene.

Full Text	CATALYST PRECURSOR FOR THE PRODUCTION OF OLEFINS WITH AN ODD NUMBER OF CARBON ATOMS, PROCESS FOR ITS PREPARATION AND PRODUCTION METHOD FOR SUCH OLEFINS The present invention relates to a catalyst precursor for the production of odd olefins, a process for its preparation as well as to a method for the production of odd olefins using that catalyst precursor. Processes for the oligomerization of ethylene or other olefins are well known in the prior art. For example, coordination compounds of iron halides with 2,6-diiminopyridines have been reported to be precatalysts for the polymerization and oligomerization of ethylene, see Small, B. L.; Brookhart, M. Journal of the American Chemical Society 1998, 120, 7143-7144; and Birtovsek, G. J. P.; Gibson, V.; Kimberley, B. S.; Maddox, P. J.; McTavish, S. J.; Solan, G. A.; White, A. J. P.; Williams, D. J. Chemical Communications (Cambridge) 1998, 849-850. Further, olefins with odd numbers of carbon atoms, e.g. 1-heptene, 1-nonene, 1-undecene or 1-tridecene are valuable chemical intermediates for the synthesis of various compounds. Up to now such odd numbered olefins are mainly isolated from natural products or are produced hi small amounts as side products of commercial procedures for the production of oligomers with even numbers of carbon atoms, e.g. the SHOP process. It is therefore an object of the present invention to overcome the disadvantages of the prior art and to provide a catalyst composition which may be utilized in an oligomerization process of ethylene for providing an increased amount of olefins having odd numbered carbon atoms. Further, it is an object of the present invention to provide a process for the preparation of that catalyst composition. The object is achieved by a catalyst precursor for the production of odd olefins having the formula: (Formula Removed) wherein X and Y are halogen and n is 2 or 3. Preferably, X is chlorine and Y is fluorine, chlorine, bromine or iodine. Additionally, a process for the preparation of the inventive catalyst precursor is provided comprising the steps of: (i) reacting 2,6-diacetylpyridine with a suitably substituted aniline to prepare a 2,6-diiminopyridine according to the following scheme: reacting the 2,6-diiminopyridine obtained in step (i) with iron halide according to the scheme: (Scheme Removed) eferably, step (i) and (ii) are carried out in an inert solvent, such as toluene, n-butanol, methylene dichloride or diethyl ether. More preferably, the oxidation state of the iron in the iron halide is +2 or +3. Additionally, a method for the production of odd olefins is provided, comprising the steps of: (a) activating the inventive catalyst precursor with an activator; and (b) oligomerizing ethylene with the activated catalyst precursor obtained in step (a). Preferably, the activator is an allcyl aluminum, methyl aluminoxane, modified methyl aluminox-ane, borate or a superacid. More preferably, the activator is an aluminum compound and the ratio of aluminum to iron is from about 50 to about 10000, preferably from about 200 to about 3000. In one embodiment, the oligomerization temperature is from about -100 to about 300°C, preferably from about -10 to about 100°C. The oligomerization may be carried out in an inert solvent, such as toluene and/or pentane. Finally, the ethylene pressure may be preferably from about 0.1 to about 60 bar, preferably from about 0.5 to about 10 bar. Surprisingly, it was found that in a process for the oligomerization of ethylene using the catalyst precursor according to the invention olefinic oligomers may be obtained having a significantly high amount of odd numbered olefins incorporated. Further, depending on the specific catalyst precursor choosen and on the specific reaction conditions, the ratio of oligomers with odd and even numbers of carbon atoms may be optimized. Additional features and advantages of the subject-matter of the present will become apparent for someone skilled in the art upon reading the following detailed description and examples section in conjunction with the accompanying drawings, wherein: Figure 1 is amass spectrum of 2,6-bis[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine; Figure 2 are 1H and I3C NMR spectra of 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine; Figure 3 shows a structure obtained by X ray analysis of 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine; Figure 4 is a mass spectrum of [2,6-bis-[l-5-(chloro-2-methylpehnylimino)-ethyl]-pyridine]iron(II)dichloride. The following abbreviations are used: FW = formula weight GC = gas chromatography GC/MS = gas chromatography followed by mass spectrometry NMR = nuclear magnetic resonance RT = room temperature MeOH = methanol EtOH = ethanol THF = tetrahydrofurane Example 1 2,6-bis-[l-(5-chloro-2-methyIphenylimino)-ethyl]-pyridine In a 25 ml round bottom flask 3 g of 2,6-diacetylpyridine (FW 163.13,18.4 mmol) and 100 ml of toluene were placed. Next a few milligrams of p-toluenesulfonic acid were added followed by 7.81 g of 5-chloro-2-methyl-aniline (FW 141.60, 55.2 mmol). The reaction mixture was heated under reflux at a Dean-Stark trap for 2 days and then cooled to room temperature. After neutralization with NaHCOs it was washed with water and the organic layer was separated using a sepa-ratory funnel. Na2SO4 was used to dry the toluene solution and the solvent was removed by distillation. The residue was recrystallized from EtOH yielding 5.88 g (78% yield) of pale yellow crystals. The product was subjected to GC/MS analysis: MS m/e (%) 411(39), 410(36), 409(57), 397(20), 396(70), 395(54), 394(100), 284(13), 244(15), 243(15), 229(16), 166(23), 131(14), 125(32), 89(26) The mass spectrum of the compound is given in Figure 1. Further, H and 13C NMR spectra were collected; 1H NMR (ppm, CDC13) 8.36 (d, 2H), 7.91 (t, 1H), 7.19 (d, 2H), 6.99 (d, 2H), 6.69 (d, 2H), 2.32 (s,6H),2.11(s,6H) 13C NMR (ppm, CDC13) 167.6, 155.1, 151.2, 132.2, 125.4, (Cq); 137.0, 131.0, 123.3, 122.5, 119.4, (CH); 16.5,14.7, (CH3) The 1H and 13C NMR spectra are given in Figure 2. Further, after recrystallization from diethyl ether suitable crystals for X ray analysis have been obtained and the following crystal data have been received. Crystal data crystal system monoclinic space group P 21/c Selected bond lengths C5-C6 = 1.497(2) C1-C15 = 1.500(1) C6-N2 = 1.271 (0) C15-N3 = 1.264(2) N2-C8 = 1.425(2) N3-C17 = 1.426(1) unit cell density (calc.) o=ll.1358(22) A b =15.7676(18) A c= 12.3067(16) A fl= 95.88(1)° 1.268g/cm3 Torsion angles C6-N2-C8-C14 C15-N3-C17-C23 -81.42(1) 91.47(1) The crystal data obtained result in the structure of the compound given in Figure 3. Example 2 2,6-bis-[l-(5-bromo-2-methylphenylimino)-ethyl]-pyridine In a 25 ml round bottom flask 3 g of 2,6-diacetylpyridine (FW 163.13,18.4 mmol) and 100 ml of toluene were placed. Next a few milligrams of p-toluenesulfonic acid were added followed by 10.27 g of 5-bromo-2-methyl-aniline (FW 186.05, 55.2 mmol). The reaction mixture was heated under reflux at a Dean-Stark trap for 8h and then cooled to room temperature. After neutralization with NaHCO3 it was washed with water and the organic layer was separated using a separa-tory funnel. Na2SO4 was used to dry the toluene solution and the solvent was removed by distil- lation. The residue was recrystallized from MeOH yielding 3.76 g (41% yield) of pale yellow crystals. The product was subjected to GC/MS analysis. Retention time = 918s MS rn/e(%) 501(26), 500(20), 499(51), 497(26), 486(53), 485(26), 484(100), 482(52), 210(16), 171(16), 169(18), 90(24), 89(16) Example 3 [2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dichloride A Schlenk tube (250ml) was evacuated and filled with argon three times. It was filled with 80 ml of dry n-butanol and 0.501 g 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine (FW 410.35, 1.2 mmol) were dissolved in it. Dry iron(II)dichloride (FW 126.75, 0.154g, 1.2 mmol) was added and the color changed immediately from yellow to blue. The reaction mixture was stirred at room temperature for one hour and then the precipitate was filtered under inert gas. The residue was washed with pentane and dried under vacuum yielding 0.63 g (96% yield). The product was characterized by mass spectrometry: MS m/e(%) 411(34), 410(21), 409(48), 408(18), 396(62), 395(23), 394(100), 296(51), 244(23), 243(19), 229(22), 166(32), 131(17), 125(32), 89(18) The mass spectrum for the catalyst precursor according to example 3 is given in Figure 4. Example 4 [2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dibromide A Schlenlc tube (250ml) was evacuated and filled with argon three times. It was filled with 80 ml of dry n-butanol and 0.500 g 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine (FW 410.35, 1.2 mmol) were dissolved in it. Dry iron(II)dibromide (FW 213.77, 0.256g, 1.2 mmol) was added and the color changed immediately from yellow to blue. The reaction mixture was stirred at RT for one hour and then the precipitate was filtered under inert gas. The residue was washed with pentane and dried under vacuum yielding 0.68 g (90% yield). The product was characterized by mass spectrometry: MS m/e(%) 546(20), 411(32), 410(23), 409(46), 396(68), 395(26), 394(100), 244(25), 243(28), 229(34), 209(18), 166(35), 131(27), 125(42), 89(26), 44(31) Example 5 Oligomerization using [2,6-bis-[l -(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dibromide as catalyst precursor A Schlenk tube was filled with 150 ml of toluene and 0.068 g of [2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dibromide (FW 625.99, 0.11 mmol) was added. The cocatalyst MAO was added (11.6 ml, Al:Fe=500:l) and the Schlenlc tube was pressurized with 1 bar of ethylene. The reaction was carried out at RT for an hour and the activity was determined by measuring the weight gained after releasing the pressure. After that the mixture was cooled to 0°C and hydrolyzed by adding water. The organic layer was separated, dried over Na2SO4 and subjected to GC analysis. The resulting activity was 2480 g(PE)/g(Fe)h"' and the amount of oligomers with odd numbers of carbon atoms was approximately 19%. Example 6 Oligomerization using [2,6-bis-[l-(5-bromo-2-methylphenylimino)-ethyl]-pyridine]iron(II)dichloride as catalyst precursor A Schlenlc tube was filled with 150 ml of toluene and 0.0176 g of [2,6-bis-[l-(5-bromo-2-methylphenylimino)-ethyl]-pyridine]iron(II)dichloride (FW 625.99, 0.028 mmol) was added. The cocatalyst MAO was added (4.3 ml, Al:Fe=750:l) and the Schlenlc tube was pressurized with 1 bar of ethylene. The reaction was carried out at 0°C for an hour and the activity was determined by measuring the weight gained after releasing the pressure. After that the mixture was hydrolyzed by adding water. The organic layer was separated, dried over Na2SO4 and subjected to GC analysis. The resulting activity was 2980 g(PE)/g(Fe)*h~' and the amount of oligomers with odd numbers of carbon atoms was approximately 6%. As can be seen, using the catalyst precursors according to the present invention in a method for oligomerization of ethylene may result in significant amounts of oligomers with odd numbers of carbon atoms. So far, no other catalyst precursor is known that produces odd olefins from ethylene in that high amount. The features disclosed in the foregoing description, in the claims and/or in the accompanying drawings may, both separately and in any combination thereof, be material for realizing the invention in diverse forms thereof. Amended Claims 1.Catalyst precursor for the production of odd olefins having the formula: (Formula Removed) 2.wherein X is bromine and Y is chlorine, or X is chlorine and Y is bromine, and n is 2 or 3. Process for the preparation of a catalyst precursor according to claim 1 comprising the steps of: (i) reacting 2,6-diacetylpyridine with a suitably substituted aniline to prepare a 2,6-diiminopyridine according to the following scheme: (Scheme Removed) (ii) reacting the 2,6-diiminopyridine obtained in step (i) with iron halide according to the scheme: (Scheme Removed) 3. Process according to claim 2, wherein step (i) and (ii) are carried out in an inert solvent. 4. Process according to claim 3, wherein the inert solvent is toluene, n-butanol, methylene dichloride or diethyl ether. 5. Process according to any of the claims 2 to 4, wherein the oxidation state of the iron in the iron halide is +2 or +3. 6. Method for the production of odd olefins comprising the steps of: (a) activating the catalyst precursor according to claim I with an activator; and (b) oligomerizing ethylene with the activated catalyst precursor obtained in step (a). 7. Method according to claim 6, wherein the activator is an alkyl aluminum, methyl aluminoxane, modified methyl aluminoxane, borate or a superacid. 8. Method according to claim 6 or 7, wherein the activator is an aluminum compound and the ratio of aluminum to iron is from about 50 to about 10000. 9. Method according to claim 8, wherein the ratio of aluminum to iron is from about 200 to about 3000. 10. Method according to any of claims 6 to 9, wherein the oligomerization temperature is from about -100 to about 300°C. 11. Method according to claim 10, wherein the oligomerization temperature is from about -10 to about 100°C. 12. Method according to any of claims 6 to 11, wherein the oligomerization is carried out in an inert solvent. 13. Method according to claim 12, wherein the inert solvent is toluene and/or pentane. 14. Method according to any of claims 6 to 13, wherein the ethylene pressure is from about 0.1 to about 60 bar 15. Method according to claim 14, wherein the pressure is from about 0.5 to about 10 bar. (Formula Removed) wherein X and Y are halogen and n is 2 or 3. Preferably, X is chlorine and Y is fluorine, chlorine, bromine or iodine. AdditionaHy, a process for the preparation of the inventive catalyst precursor is provided comprising the steps of: (i) reacting 2,6-diaceiylpyridine with a suitably substituted aniline to prepare a 2,6-diiminopyridine according to the following scheme: (Scheme Removed) reacting the 2,6-diimlnopyridine obtained in step (i) with iron halide according to the scheme:

Full Text

CATALYST PRECURSOR FOR THE PRODUCTION OF OLEFINS WITH AN ODD NUMBER OF CARBON ATOMS, PROCESS FOR ITS PREPARATION AND PRODUCTION METHOD FOR SUCH OLEFINS
The present invention relates to a catalyst precursor for the production of odd olefins, a process for its preparation as well as to a method for the production of odd olefins using that catalyst precursor.
Processes for the oligomerization of ethylene or other olefins are well known in the prior art. For example, coordination compounds of iron halides with 2,6-diiminopyridines have been reported to be precatalysts for the polymerization and oligomerization of ethylene, see Small, B. L.; Brookhart, M. Journal of the American Chemical Society 1998, 120, 7143-7144; and Birtovsek, G. J. P.; Gibson, V.; Kimberley, B. S.; Maddox, P. J.; McTavish, S. J.; Solan, G. A.; White, A. J. P.; Williams, D. J. Chemical Communications (Cambridge) 1998, 849-850.
Further, olefins with odd numbers of carbon atoms, e.g. 1-heptene, 1-nonene, 1-undecene or 1-tridecene are valuable chemical intermediates for the synthesis of various compounds. Up to now such odd numbered olefins are mainly isolated from natural products or are produced hi small amounts as side products of commercial procedures for the production of oligomers with even numbers of carbon atoms, e.g. the SHOP process.
It is therefore an object of the present invention to overcome the disadvantages of the prior art and to provide a catalyst composition which may be utilized in an oligomerization process of ethylene for providing an increased amount of olefins having odd numbered carbon atoms. Further, it is an object of the present invention to provide a process for the preparation of that catalyst composition.
The object is achieved by a catalyst precursor for the production of odd olefins having the formula:
(Formula Removed)
wherein X and Y are halogen and n is 2 or 3.
Preferably, X is chlorine and Y is fluorine, chlorine, bromine or iodine.
Additionally, a process for the preparation of the inventive catalyst precursor is provided comprising the steps of:
(i) reacting 2,6-diacetylpyridine with a suitably substituted aniline to prepare a 2,6-diiminopyridine according to the following scheme:

reacting the 2,6-diiminopyridine obtained in step (i) with iron halide according to the scheme:

(Scheme Removed)
eferably, step (i) and (ii) are carried out in an inert solvent, such as toluene, n-butanol, methylene dichloride or diethyl ether.
More preferably, the oxidation state of the iron in the iron halide is +2 or +3.
Additionally, a method for the production of odd olefins is provided, comprising the steps of:
(a) activating the inventive catalyst precursor with an activator; and
(b) oligomerizing ethylene with the activated catalyst precursor obtained in
step (a).
Preferably, the activator is an allcyl aluminum, methyl aluminoxane, modified methyl aluminox-ane, borate or a superacid.
More preferably, the activator is an aluminum compound and the ratio of aluminum to iron is from about 50 to about 10000, preferably from about 200 to about 3000.
In one embodiment, the oligomerization temperature is from about -100 to about 300°C, preferably from about -10 to about 100°C.
The oligomerization may be carried out in an inert solvent, such as toluene and/or pentane.

Finally, the ethylene pressure may be preferably from about 0.1 to about 60 bar, preferably from about 0.5 to about 10 bar.
Surprisingly, it was found that in a process for the oligomerization of ethylene using the catalyst precursor according to the invention olefinic oligomers may be obtained having a significantly high amount of odd numbered olefins incorporated.
Further, depending on the specific catalyst precursor choosen and on the specific reaction conditions, the ratio of oligomers with odd and even numbers of carbon atoms may be optimized.
Additional features and advantages of the subject-matter of the present will become apparent for someone skilled in the art upon reading the following detailed description and examples section in conjunction with the accompanying drawings, wherein:
Figure 1 is amass spectrum of 2,6-bis[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine;
Figure 2 are 1H and I3C NMR spectra of 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine;
Figure 3 shows a structure obtained by X ray analysis of 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine;
Figure 4 is a mass spectrum of [2,6-bis-[l-5-(chloro-2-methylpehnylimino)-ethyl]-pyridine]iron(II)dichloride.
The following abbreviations are used:

FW = formula weight
GC = gas chromatography
GC/MS = gas chromatography followed by mass spectrometry
NMR = nuclear magnetic resonance
RT = room temperature
MeOH = methanol
EtOH = ethanol
THF = tetrahydrofurane
Example 1
2,6-bis-[l-(5-chloro-2-methyIphenylimino)-ethyl]-pyridine
In a 25 ml round bottom flask 3 g of 2,6-diacetylpyridine (FW 163.13,18.4 mmol) and 100 ml of toluene were placed. Next a few milligrams of p-toluenesulfonic acid were added followed by 7.81 g of 5-chloro-2-methyl-aniline (FW 141.60, 55.2 mmol). The reaction mixture was heated under reflux at a Dean-Stark trap for 2 days and then cooled to room temperature. After neutralization with NaHCOs it was washed with water and the organic layer was separated using a sepa-ratory funnel. Na2SO4 was used to dry the toluene solution and the solvent was removed by distillation. The residue was recrystallized from EtOH yielding 5.88 g (78% yield) of pale yellow crystals. The product was subjected to GC/MS analysis:
MS m/e (%) 411(39), 410(36), 409(57), 397(20), 396(70), 395(54), 394(100), 284(13), 244(15), 243(15), 229(16), 166(23), 131(14), 125(32), 89(26)
The mass spectrum of the compound is given in Figure 1. Further, *H and 13C NMR spectra were collected;
1H NMR (ppm, CDC13) 8.36 (d, 2H), 7.91 (t, 1H), 7.19 (d, 2H), 6.99 (d, 2H), 6.69 (d, 2H), 2.32 (s,6H),2.11(s,6H)

13C NMR (ppm, CDC13) 167.6, 155.1, 151.2, 132.2, 125.4, (Cq); 137.0, 131.0, 123.3, 122.5, 119.4, (CH); 16.5,14.7, (CH3)
The 1H and 13C NMR spectra are given in Figure 2.
Further, after recrystallization from diethyl ether suitable crystals for X ray analysis have been obtained and the following crystal data have been received.

Crystal data
crystal system monoclinic
space group P 21/c

Selected bond lengths C5-C6 = 1.497(2) C1-C15 = 1.500(1) C6-N2 = 1.271 (0) C15-N3 = 1.264(2) N2-C8 = 1.425(2) N3-C17 = 1.426(1)

unit cell
density (calc.)

o=ll.1358(22) A b =15.7676(18) A c= 12.3067(16) A fl= 95.88(1)° 1.268g/cm3

Torsion angles
C6-N2-C8-C14
C15-N3-C17-C23

-81.42(1) 91.47(1)

The crystal data obtained result in the structure of the compound given in Figure 3.
Example 2
2,6-bis-[l-(5-bromo-2-methylphenylimino)-ethyl]-pyridine
In a 25 ml round bottom flask 3 g of 2,6-diacetylpyridine (FW 163.13,18.4 mmol) and 100 ml of toluene were placed. Next a few milligrams of p-toluenesulfonic acid were added followed by 10.27 g of 5-bromo-2-methyl-aniline (FW 186.05, 55.2 mmol). The reaction mixture was heated under reflux at a Dean-Stark trap for 8h and then cooled to room temperature. After neutralization with NaHCO3 it was washed with water and the organic layer was separated using a separa-tory funnel. Na2SO4 was used to dry the toluene solution and the solvent was removed by distil-

lation. The residue was recrystallized from MeOH yielding 3.76 g (41% yield) of pale yellow crystals. The product was subjected to GC/MS analysis.
Retention time = 918s
MS rn/e(%) 501(26), 500(20), 499(51), 497(26), 486(53), 485(26), 484(100), 482(52), 210(16),
171(16), 169(18), 90(24), 89(16)
Example 3
[2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dichloride
A Schlenk tube (250ml) was evacuated and filled with argon three times. It was filled with 80 ml of dry n-butanol and 0.501 g 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine (FW 410.35, 1.2 mmol) were dissolved in it. Dry iron(II)dichloride (FW 126.75, 0.154g, 1.2 mmol) was added and the color changed immediately from yellow to blue. The reaction mixture was stirred at room temperature for one hour and then the precipitate was filtered under inert gas. The residue was washed with pentane and dried under vacuum yielding 0.63 g (96% yield). The product was characterized by mass spectrometry:
MS m/e(%) 411(34), 410(21), 409(48), 408(18), 396(62), 395(23), 394(100), 296(51), 244(23), 243(19), 229(22), 166(32), 131(17), 125(32), 89(18)
The mass spectrum for the catalyst precursor according to example 3 is given in Figure 4.
Example 4
[2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dibromide
A Schlenlc tube (250ml) was evacuated and filled with argon three times. It was filled with 80 ml of dry n-butanol and 0.500 g 2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine (FW

410.35, 1.2 mmol) were dissolved in it. Dry iron(II)dibromide (FW 213.77, 0.256g, 1.2 mmol) was added and the color changed immediately from yellow to blue. The reaction mixture was stirred at RT for one hour and then the precipitate was filtered under inert gas. The residue was washed with pentane and dried under vacuum yielding 0.68 g (90% yield). The product was characterized by mass spectrometry:
MS m/e(%) 546(20), 411(32), 410(23), 409(46), 396(68), 395(26), 394(100), 244(25), 243(28), 229(34), 209(18), 166(35), 131(27), 125(42), 89(26), 44(31)
Example 5
Oligomerization using [2,6-bis-[l -(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dibromide as catalyst precursor
A Schlenk tube was filled with 150 ml of toluene and 0.068 g of [2,6-bis-[l-(5-chloro-2-methylphenylimino)-ethyl]-pyridine]iron(II)dibromide (FW 625.99, 0.11 mmol) was added. The cocatalyst MAO was added (11.6 ml, Al:Fe=500:l) and the Schlenlc tube was pressurized with 1 bar of ethylene. The reaction was carried out at RT for an hour and the activity was determined by measuring the weight gained after releasing the pressure. After that the mixture was cooled to 0°C and hydrolyzed by adding water. The organic layer was separated, dried over Na2SO4 and subjected to GC analysis.
The resulting activity was 2480 g(PE)/g(Fe)*h"' and the amount of oligomers with odd numbers of carbon atoms was approximately 19%.
Example 6
Oligomerization using [2,6-bis-[l-(5-bromo-2-methylphenylimino)-ethyl]-pyridine]iron(II)dichloride as catalyst precursor

A Schlenlc tube was filled with 150 ml of toluene and 0.0176 g of [2,6-bis-[l-(5-bromo-2-methylphenylimino)-ethyl]-pyridine]iron(II)dichloride (FW 625.99, 0.028 mmol) was added. The cocatalyst MAO was added (4.3 ml, Al:Fe=750:l) and the Schlenlc tube was pressurized with 1 bar of ethylene. The reaction was carried out at 0°C for an hour and the activity was determined by measuring the weight gained after releasing the pressure. After that the mixture was hydrolyzed by adding water. The organic layer was separated, dried over Na2SO4 and subjected to GC analysis.
The resulting activity was 2980 g(PE)/g(Fe)*h~' and the amount of oligomers with odd numbers of carbon atoms was approximately 6%.
As can be seen, using the catalyst precursors according to the present invention in a method for oligomerization of ethylene may result in significant amounts of oligomers with odd numbers of carbon atoms.
So far, no other catalyst precursor is known that produces odd olefins from ethylene in that high amount.
The features disclosed in the foregoing description, in the claims and/or in the accompanying drawings may, both separately and in any combination thereof, be material for realizing the invention in diverse forms thereof.

Amended Claims
1.Catalyst precursor for the production of odd olefins having the formula:
(Formula Removed)
2.wherein X is bromine and Y is chlorine, or X is chlorine and Y is bromine, and n is 2 or 3.
Process for the preparation of a catalyst precursor according to claim 1 comprising the steps of:
(i) reacting 2,6-diacetylpyridine with a suitably substituted aniline to prepare a 2,6-diiminopyridine according to the following scheme:
(Scheme Removed)
(ii) reacting the 2,6-diiminopyridine obtained in step (i) with iron halide according to the scheme:
(Scheme Removed)
3. Process according to claim 2, wherein step (i) and (ii) are carried out in an inert solvent.
4. Process according to claim 3, wherein the inert solvent is toluene, n-butanol, methylene dichloride or diethyl ether.
5. Process according to any of the claims 2 to 4, wherein the oxidation state of the iron in the iron halide is +2 or +3.
6. Method for the production of odd olefins comprising the steps of:

(a) activating the catalyst precursor according to claim I with an activator; and
(b) oligomerizing ethylene with the activated catalyst precursor obtained in step (a).
7. Method according to claim 6, wherein the activator is an alkyl aluminum, methyl
aluminoxane, modified methyl aluminoxane, borate or a superacid.
8. Method according to claim 6 or 7, wherein the activator is an aluminum compound and
the ratio of aluminum to iron is from about 50 to about 10000.
9. Method according to claim 8, wherein the ratio of aluminum to iron is from about 200 to
about 3000.
10. Method according to any of claims 6 to 9, wherein the oligomerization temperature is
from about -100 to about 300°C.
11. Method according to claim 10, wherein the oligomerization temperature is from about -10
to about 100°C.
12. Method according to any of claims 6 to 11, wherein the oligomerization is carried out in
an inert solvent.
13. Method according to claim 12, wherein the inert solvent is toluene and/or pentane.
14. Method according to any of claims 6 to 13, wherein the ethylene pressure is from about
0.1 to about 60 bar
15. Method according to claim 14, wherein the pressure is from about 0.5 to about 10 bar.

(Formula Removed)
wherein X and Y are halogen and n is 2 or 3.
Preferably, X is chlorine and Y is fluorine, chlorine, bromine or iodine.
AdditionaHy, a process for the preparation of the inventive catalyst precursor is provided comprising the steps of:
(i) reacting 2,6-diaceiylpyridine with a suitably substituted aniline to prepare a 2,6-diiminopyridine according to the following scheme:

(Scheme Removed)
reacting the 2,6-diimlnopyridine obtained in step (i) with iron halide according to the scheme:

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Patent Number

258836

Indian Patent Application Number

7822/DELNP/2007

PG Journal Number

07/2014

Publication Date

14-Feb-2014

Grant Date

10-Feb-2014

Date of Filing

10-Oct-2007

Name of Patentee

SAUDI BASIC INDUSTRIES CORPORATION.

Applicant Address

P.O.BOX 5101, RIYADH, 11422, SAUDI ARABIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	SEITZ, MARCUS	STOCKHEIM 24, 95473 CREUSSEN, GERMANY.
2	ALT, HELMUT, G.	WACHOLDERWEG 27, 95445 BAYREUTH, GERMANY.
3	RAQUABAH, ATIEH, ABU	P.O. BOX 5101, 11422 RIYADH, SAUDI ARABIA.
4	PALACKAL, SYRIAC, J.	P.O. BOX 5101, 11422 RIYADH, SAUDI ARABIA.

PCT International Classification Number

B01J 31/18

PCT International Application Number

PCT/EP2006/003035

PCT International Filing date

2006-04-04

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	05009441.6	2005-04-29	EPO