Antihistaminic 9-(4-piperidylidene)-thioxanthene-n-oxides - prodn - from corresp thioxanthenes with hydrogen peroxide or periodat

摘要

Novel cpds. of the formula (I) and their acid addn. salts (R = 1-4O alkyl) for use as antihistaminics, serotonin- antagonists and anticholinergics are prepd. by oxidising the corresp. thioxanthenes with H2O2 at 30-100 degrees or with alkali periodates at 0-30 degrees.