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The solvent effect and temperature dependence on the Raman and absorption spectra demonstrated the existence of a tautomeric equilibrium for the title compound between the enol form and the protonated Schiff base form in methanol; the latter form is more stable by ca. 850 cal mol−1(1 cal=4.184 J) than the former. Characteristic Raman bands for the two tautomers have been identified.
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Lee et al. (1986) studied this question.
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