SCHEDULED MAINTENANCE
Photoelectron spectra of the title compounds demonstrate that 3- and 4-hydroxy- and 3- and 4-mercapto-pyridine exist in the vapour phase in the hydroxy- and mercapto-forms with less than 5% of the oxo- or thioxo-tautomers. However, although the hydroxy- and mercapto-tautomers are also predominant for the 2-series, significant quantities of 2-pyridone and pyridine-2-thione exist in equilibrium.
M. J. Cook, S. El-Abbady, A. R. Katritzky, C. Guimon and G. Pfister-Guillouzo, J. Chem. Soc., Perkin Trans. 2, 1977, 1652 DOI: 10.1039/P29770001652
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