Several derivatives of mesoionic 5-substituted 1,2,3-thiadiazolium-4-olate were synthesised. The 5-aminoderivative (2i) gave a new mesoionic system, 1,2,3-thiadiazolium-5-ethoxycarbonylaminide (4), upon methylation with methyl fluorosulphonate.
K. Masuda, J. Adachi and K. Nomura, J. Chem. Soc., Perkin Trans. 1, 1979, 2349 DOI: 10.1039/P19790002349
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