A study was made of the solvent effects observed in the absorption spectra of N-(2-hydroxy-1-naphthylidene)anilines, N-(2-hydroxybenzylidene)amines and N-(4-hydroxybenzylidene)aniline in various solvents. It was established that the logarithm of the constant describing the equilibrium enol ⇔ keto tautomer correlates closely with the parameters EN T and BKT characteristic of the acidity or basicity of the solvents.
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Herzfeld et al. (1999) studied this question.
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