PROCEDURE FOR THE OBTAINING OF OPTICALLY ACTIVE ISOMERS OF TRANS-3- (2-CHLORINE-2- (4-CHLORINE-PHENYL) -VINYL) -2,2-DIME-TIL-CICLOPROPAN-1-CARBOXYLATE OF (A- CIANO-4-FLUOR-3-PENOXI- BENCILO)

摘要

The invention relates to optically active isomers of trans-3-(2-chloro-2-(4-chloro-phenyl)-vinyl-2,2-dimethyl-cyclopropane- 1-carboxylic acid alpha - cyano-4-fluoro-3-phenoxy-benzyl ester of Formula (I), to methods for the preparation of said optically active isomers, to compositions containing said optically active isomers and to the use of said optically active isomers and compositions for their ectoparasiticidal activity.