A process for preparing an optically active cyclopentenone of the formula: ##STR1## wherein R is a hydrogen atom or a lower alkyl group and n is an integer of 4 to 8, which comprises contacting a dl-cyclopentenone ester of the formula: ##STR2## wherein R and n are each as defined above and R' is a lower alkyl group optionally substituted with halogen on an enzyme having a capability of hydrolyzing selectively either one of the d- or l-form isomer in the dl-cyclopentenone ester (II) in an aqueous medium for asymmetric hydrolysis.
一种制备光学活性
环戊酮的方法,其
化学式为:##STR1## 其中R是氢原子或较低的烷基基团,n是4至8的整数,该方法包括将dl-
环戊酮酯与
化学式为:##STR2## 其中R和n如上所定义,R'是较低的烷基基团,可选地被卤素取代的酶在
水介质中接触,具有选择性
水解dl-
环戊酮酯(II)中d-或l-异构体之一的能力,进行不对称
水解。