During its preparation, 4-ethoxycarbonyl-5-diazomethyl-1,2,3-thiadiazole (4), undergoes a ring transformation into the isomeric structure (5), but when the ester function in (4) is replaced by a phenyl group, no isomerization is observed.
G. L'abbé, J. Dekerk and M. Deketele, J. Chem. Soc., Chem. Commun., 1983, 588 DOI: 10.1039/C39830000588
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