Ns. Cho et al., SYNTHESIS OF 5-AROYLAMINO-3H-1,3,4-THIADIAZOLE-2-THIONES AND THEIR TAUTOMERISM, Journal of heterocyclic chemistry, 30(2), 1993, pp. 397-401
5-Aroylamino-3H-1,3,4-thiadiazole-2-thiones 2 have been synthesized by
acylation of 5-amino-3H-1,3,4-thi-adiazole-2-thione 1. 5-Aroylamino-3
H-1,3,4-thiadiazole-2-thiones can exist in two tautomeric forms - a th
iol form and a thione form. On the basis of the C-13 nmr spectra and a
dditional experimental information, it has been established that the t
hione form is the stable form in which these compounds exist.