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Proton magnetic resonance (pmr) spectroscopy was used to determine the keto-enol equilibria as a function of solvent and temperature in the Schiff bases derived from the N15-substituted anilines and the following aldehydes and ketones: benzoylacetone, 2-acetyldimedone, salicylaldehyde, 2-hydroxyacetophenone, 2-hydroxy-lnaphthaldehyde, and 1 -hydroxy-2-acetonaphthone. The ultraviolet spectra of a number of these Schiff bases were recorded and, with the aid of the pmr data, the ultraviolet extinction coefficients were computed for the tautomers of each base. The values of the extinction coefficients indicated that the pmr and ultraviolet spectra were measuring the same phenomenon.

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