Tautomeric equilibria of the hydroxypyridine–pyridone type are investigated for five compounds: the proportion of pyridone form, dominant for H2O solutions, falls roughly linearly with the solvent polarity as measured by Z. In cyclohexane solution, comparable amounts of both forms are present.
J. Frank and A. R. Katritzky, J. Chem. Soc., Perkin Trans. 2, 1976, 1428 DOI: 10.1039/P29760001428
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