Process for preparing cis-3-(2,2-dihalovinyl)-2,2-dimethylcyclopropanecarboxylic acid

摘要

Novel lactones of 2,2-dimethyl-cyclopropane-1-carboxylic acids of the formula <IMAGE> I wherein X1, X2 and X3 when identical are selected from the group consisting of chlorine and bromine and when at least two are different, are selected from the group consisting of fluorine, chlorine and bromine and a novel process for their preparation and a process for the preparation of cis 2,2-dimethylcyclopropane-1-carboxylic acids of the formula <IMAGE> IV