3-Oxobenzofuranyl-2-idenyl, haloacetic acids

摘要

Novel halogeno-benzofuranone-carboxylic acids and a novel process for their preparation by reacting substituted or unsubstituted phenols with dihalogenomaleic anhydrides or derivatives thereof are described. The novel halogeno-benzofuranone-carboxylic acids are valuable intermediates for the preparation of pharmaceutical active compounds having an antiallergic action or for the preparation of biocidal active compounds for combating plant and animal pests, in particular phytopathogenic fungi and bacteria.