申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0282221A2
公开(公告)日:1988-09-14
Racemization of an optically active chrysanthemic acid or its ester of the formula:
wherein R represents a hydrogen atom, an alkyl group of 1-20 carbon atoms, a cycloalkyl group of 3-20 carbon atoms or an aralkyl group of 7-20 carbon atoms and * mark indicates asymmetric carbon atom, is effected by contacting the acid or its ester with at least one compound selected from the group consisting of a carboxylic acid bromide, a silicon bromide, an S-bromine compound, and N-bromine compound, a halo-bromine compound and an SH compound in the presence of a peroxide or an azo compound.
式中具有光学活性的菊酸或其酯的外消旋化:
其中 R 代表氢原子、1-20 个碳原子的烷基、3-20 个碳原子的环烷基或 7-20 个碳原子的芳烷基,* 标记表示不对称碳原子,在过氧化物或偶氮化合物存在下,将该酸或其酯与至少一种选自羧酸溴化物、硅溴化物、S-溴化合物、N-溴化合物、卤代溴化合物和 SH 化合物的化合物接触。