Abstract
The X-ray diffraction study of potentially tautomeric 3(5)-butylsulfanyl-5(3)-methyl-1H-1,2,4-triazole and its 5(3)-phenyl-substituted analog showed that these compounds in crystal have the structure of 3-butylsulfanyl-5-methyl(phenyl)-1H-tautomers. Analysis of our experimental and published data indicated that 3(5)-monosubstituted 1,2,4-triazoles and 3,5-disubstituted derivatives having nonequivalent substituents in crystal as exist as a tautomer in which the electron-acceptor substituent (RA) occupies the 3 position, while the electron-donor substituent (RD) resides in the 5 position, i.e., as 3-RA-5-RD-1H-1,2,4-triazoles. Symmetric 3,5-disubstituted 1,2,4-triazoles could give rise to tautomeric equilibrium between the 1H-and 2H-structures even in crystal.
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Original Russian Text © B.I. Buzykin, E.V. Mironova, V.N. Nabiullin, A.T. Gubaidullin, I.A. Litvinov, 2006, published in Zhurnal Obshchei Khimii, 2006, Vol. 76, No. 9, pp. 1534–1550.
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Buzykin, B.I., Mironova, E.V., Nabiullin, V.N. et al. Tautomerism of aza cycles: I. Structure of 3(5)-butylsulfanyl-5(3)-methyl(phenyl)-1H-1,2,4-triazole tautomers in crystal. Preference of the 3-RA-5-RD-1H-tautomer of 3(5)-mono-and 3,5-disubstituted 1,2,4-triazoles. Russ J Gen Chem 76, 1471–1486 (2006). https://doi.org/10.1134/S1070363206090209
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DOI: https://doi.org/10.1134/S1070363206090209