Process for preparing dihalovinylcyclopropanecarboxylic acids

摘要

A cyclopropanecarboxylic acid of the formula <IMAGE> is prepared by the reaction of a compound of the formula <IMAGE> with an alkali metal hydroxide or alkaline earth metal hydroxide in an ether type solvent. R1, R2, and R4 each independently is hydrogen or a hydrocarbon residue, R3 is hydrogen or lower alkyl, X is halogen, and A is -CH2-CX, 3 or -CH=CX2.