SCHEDULED MAINTENANCE
A series of 10-hydroxy-1,7-phenanthrolines are shown to prefer the hydroxy- to the pyridone-form for both polar and nonpolar media. This tendency results both from stabilisation of the hydroxy-form by intramolecular hydrogen-bonding, similar examples of which are discussed, and from destabilisation of the pyridone form by electron repulsion terms.
G. P. Bean, M. J. Cook, T. M. Dand, A. R. Katritzky and J. R. Lea, J. Chem. Soc. B, 1971, 2339 DOI: 10.1039/J29710002339
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