Improved method for the preparation of 4-methylsulfonyl benzoic acid derivatives and intermediates.

摘要

This invention relates to an improved process for preparing an herbicidal intermediate compound having the structural formula:- wherein groups X are independently selected from alkyl, haloalkyl, CN, halo, alkoxy, nitro, or S(O)mR<2> where R<2> is alkyl and m is 0, 1 or 2, n is 0 or an integer of from 1 to 4 and R<5> is hydrogen or C1-6 alkyl and intermediate compounds.