Resolution of the (+)2,2-dimethyl-3-(2,2-disubstitutedvinyl)-cyclopropane-1- carboxylic acids from its optical Isomers

摘要

A process for resolving (+)-cis-2,2-dimethyl-3-(2,2-dihalogenovinyl)-cyclopropane-1-carboxylic acids of formula (I), in which X=Fluorine, chlorine or bromine, from a mixture of cis(Œ) or cis(Œ) and trans(Œ) using the salt of the optically active base L-Ephedrine at temperatures ranging between 10-80‹C.