Abstract
The reaction of 9-phenylthioxanthylium salt (II) with a mixed acid gave dinitrated II in 91% yield. In order to determine the structure of dinitrated II, 4-nitro-9-(m-nitrophenyl) thioxanthene (IV), 4-acetamido-9-(p-acetamidophenyl) thioxanthene (VI), 2, 4-dinitro-9-phenylthioxanthene (XV), and their ralated compounds were synthesized. And it was confirmed that the dinitration of II gives 4-nitro-9-(m-nitrophenyl) thioxanthylium and 4-nitro-9-(p-nitrophenyl) thioxanthylium salts in the ratio of formation being 1.0 : 1.2. Thus, it was recognized that the nitration of II occurs in the phenyl group at 9-position and then at 4-position in the hetero ring of II.
