Vinyl-di:methyl-cyclopropane carboxylic acid ester derivs. mfr. - by reacting a 3-formyl-2,2-di:methyl-cyclopropane carboxylic acid ester with a di:chloro-methane-phosphonic acid deriv.

摘要

The prepn. of 3-(2,2-dichlorovinyl) 2,2-dimethyl-cyclopropane 1-carboxylic acid derivs. of formula (I): (where R is H; alkali metal or alkaline earth metal equiv.; alkyl; or a gp. usual in the alcohol portion of a pyrethroid) comprises reacting a 3-formyl 2,2-dimethylcyclopropane 1-carboxylic acid deriv. of formula (II) with a dichloromethane deriv. of formula:.