Process for separating cis and trans isomers of cyclopropane...

Details Process for separating cis and trans isomers of cyclopropane... Process for separating cis and trans isomers of cyclopropane...

C - Chemistry, Metallurgy

07

C

260/532

C07C 61/35 (2006.01) C07C 51/487 (2006.01)

Patent

CA 1125786

- 10 - PROCESS OF SEPARATING CIS AND TRANS ISOMERS OF CYCLOPROPANE CARBOXYLIC ACIDS ABSTRACT A process of separating cis and trans isomers of cyclopropane carboxylic acids comprising the step of treating an aqueous solution of a soluble salt of the cis and trans isomers with just sufficient of an acid, for example acetic acid or carbonic acid, to cause precipi- tation of one isomeric form of the cyclopropane carboxy- lic acid whilst substantially all or a major proportion of the other isomeric form remains in solution as the soluble salt. The process may be used, for example, to separate (?)-cis-3-(2,2-dichlorovinyl)-2,2-dimethyl- cyclopropane carboxylic acid (an intermediate for insecticides) from a mixture of the (?)-cis and (?)-trans acids.

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