|Title of Invention
A PROCESS FOR PREPARING THE CRYSTALLINE DIPHENYLMETHYL 2-METHYL-2-TRIAZOLYLMETHYLPENAM-3-CARBOXYLATE
|Stable crystals of diphenylmethyl 2-methyl-2-triazolyl-methylpenam-3-carboxylate, which cause substantially no decomposition or deterioration even after allowing to stand at room temperature for one year. The crystals are produced by concentrating a solution of diphenylmethyl 2-methyl-2-triazolylmethylpenam-3-carboxylate of formula (2), diluting the resulting concentrate with an acetic ester, and mixing the obtained dilution with hexane or a hexane/acetic ester mixture to crystallize diphenylmethyl 2-methyl-2-triazolylmethyl-penam-3-carboxylate wherein Ph is phenyl.
|Indian Patent Application Number
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|Date of Filing
|Name of Patentee
|OTSUKA CHEMICAL CO., LTD.
|2-27, Otedori 3-chome, Chuo-ku, Osaka-shi, Osaka 540-0021
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|PCT International Application Number
|PCT International Filing date