2,5-Diaryl-1,6-dioxa-6a-thia-3,4-diazapentalenes are obtained when 5-amino-1,2,3,4-thiatrizole is treated with aroyl chlorides and pyridine, but acetylation of 5-amino-1,2,3,4-thiatriazole yields 3,5-diacetamido-1,2,4-thiadiazole.
R. J. S. Beer and I. Hart, J. Chem. Soc., Chem. Commun., 1977, 143 DOI: 10.1039/C39770000143
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