Abstract 4-Dimethylamino-, 4-pyrrolidino-, 4-piperidino-, 4-morpholino-and 4-(4- methylpiperazino)-thiophenol (IIIa-IIIe), which were prepared by two methods and characterized as the 2, 4-dinitrodiphenyl sulfides IVb-IVe, were transformed by treatment with 2-iodobenzoic acid and copper in aqueous potassium hydroxide to 2-(4-tert. aminophenylthio) benzoic acids (Va-Ve). Cyclization with polyphosphoric acid gave ...