3-Oxobenzothiophenyl-idenyl, halo-acetic acids

摘要

Novel halogeno-benzothiophenecarboxylic acids and a novel process for their preparation by reacting substituted or unsubstituted thiophenols with dihalogenomaleic anhydrides or derivatives thereof are described. The novel halogeno-benzothiophenecarboxylic acids are valuable intermediates for the preparation of pharmaceutical active compounds having an antiallergic action.