PROCESS FOR THE PREPARATION OF 2(3H)-BENZOTHIAZOLONES

摘要

of the disclosure: Process for the preparation of 2(3H)-benzothiazolones The process for the preparation of 2(3H)-benzothiazolones which are optionally substituted on the benzene ring by reacting a 2-aminobenzothiazole which is optionally substituted on the benzene ring with a diazothization agent in the presence of aqueous hydrochloric acid, if appropriate with addition of a chloride, to give a diazonium chloride, reacting the diazonium chloride directly to give a 2-chlorobenzothiazole, which is optionally substituted on the benzene ring, and hydrolyzing the 2-chlorobenzothiazole, without intermediate isolation, at 120 - 200.degree.C under reaction pressure.