Ring-chain tautomerism of thiosemicarbazones of salicylaldehyde and pyridinecarbaldehyde in acidic media

Abstract

On the basis of NMR spectroscopic data, it has been found that 4-substituted thosemicarbazones of salicylaldehyde and α-, β-, and γ- pyridinecarbaldehydes in solutions of trifluoroacetic acid are tautomeric mixtures of protonated linear and cyclic 1,3,4-thiadiazolidine-2-imine forms, the linear tautomer having an azinethiol structure with localization of the proton on the N₍₂₎ nitrogen atom.

How to Cite
Zelenin, K. N.; Kuznetsova, O. B.; Alekseev, V. V.; Kalvin'sh, I. Ya.; Leitis, L. Ya. Chem. Heterocycl. Compd. 1994, 30, 107. [Khim. Geterotsikl. Soedin. 1994, 119.]

For this article in the English edition, see DOI https://doi.org/10.1007/BF01164745