MENTHYL ESTERS OF ENANTIOMERS OF CHIRAL(DIHALOVINYL)DIMETHYLCYCLOPROPANE AND THEIR PREPARATION

摘要

A substantially pure compound selected from the group consisting of the d-menthyl esters of 1RS-cis-, 1RS-cis/trans-, 1R-cis-, 1S-cis-, 1R- trans- and 1S-trans-3-(2,2-dichloro- and dibromo-vinyl)-2,2- dimethylcyclopropanecarboxylic acid, the 1-menthyl esters of 1RS-cis-, 1RS-trans-, 1RS-cis/trans-, 1R-cis-, 1S-cis-, 1R-trans- and 1S-trans-3-(2, 2-dibromo-vinyl)-2,2-dimethyl-cyclopropanecarboxylic acid and the 1- menthyl esters of 1R-trans- and 1S-trans-3-(2,2-dichloro-vinyl)-2,2- dimethyl-cyclopropanecarboxylic acid. The esters are produced by reacting enantiomers of the acids with d- or 1-menthol are selectively crystallizing.