4-Acetyldithieno[2,3-b;3′,2′-e][1,4]thiazine has been synthesized by direct sulphuration of N-acetyldi-3-thienylamine with sulphur dichloride. Hydrolysis of the latter amide afforded di-3-thienylamine, which was not present in the imino-form as shown by 1H n.m.r. spectroscopy.
C. J. Grol, J. Chem. Soc., Perkin Trans. 1, 1975, 1234 DOI: 10.1039/P19750001234
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