Treatment of various mesoionic 1,3,4-thiadiazoles with dimethyl acetylenedicarboxylate yields tetramethylthiophen tetracarboxylate and the S-cyanothioimidate derivative; a mechanism involving fragmentation of the mesoionic ring is suggested.
R. M. Moriarty and A. Chin, J. Chem. Soc., Chem. Commun., 1972, 1300a DOI: 10.1039/C3972001300A
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