PREPARATION OF 2,2-DIMETHYL-3-ARYL-CYCLOPROPANECARBOXYLIC ACIDS AND NEW INTERMEDIATE 1-ARYL-1,4-DIHALO-2,2-DIMETHYL-3-BUTANONE DERIVATIVES THEREFOR

摘要

2,2-Dimethyl-3-arylcyclopropanecarboxylic acids and esters, suitable as insecticide intermediates, of the formula IMAGE (I) in which Ar is naphthyl or substituted furyl, thienyl or phenyl, and R1 is hydrogen or alkyl, are produced by subjecting IMAGE (IV) to radical polymerization to produce IMAGE (III) reacting that with chlorine or bromine to produce IMAGE (II) and reacting that with an alkali metal or alkaline earth metal hydroxide or carbonate. Various intermediates II and III are new.