Abstract

The solvent effect on trans-enolization of different keto-enols is discussed. Ultra-violet and infra-red data are presented on keto-enol equilibrium in α-alkyltetronic acids, isopropylidene alkyl malonates, and α-alkyl-substituted alkyl acetoacetates, bromometrical evidence also being produced for the latter compounds. The limitations of Meyer's rule and Eistert and Reiss' hypothesis as to trans-enolization are shown and the general applicability of the relationship K T = EL + E′L′ is demonstrated.

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