Two circumstantial but independent arguments both confirm that the 2H-tautomer of 1,2,3-triazole is favoured in aqueous solution by a factor of ca. two. Lone-pair repulsion is the probable cause; evidence from the solvent dependence of the tautomeric ratio is discussed.
A. Albert and P. J. Taylor, J. Chem. Soc., Perkin Trans. 2, 1989, 1903 DOI: 10.1039/P29890001903
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