Очень надо статью из J. Chem. Soc., Perkin Trans. 2, 1990, 1215 - 1219, DOI: 10.1039/P29900001215
A 1H and 13C nuclear magnetic resonance and X-ray diffraction study of the tautomerism of 2-hydroxy- and 2,3-dihydroxy-pyridine N-oxides. X-Ray molecular structure of 2-hydroxypyridine N-oxide
Paloma Ballesteros, Rosa Ma. Claramunt, Teresa Cañada, Concepcion Foces-Foces, Félix Hernández Cano, José Elguero and Alain Fruchier
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http://www.rsc.org/Publishing/Journals/P2/article.asp?doi=P29900001215