Deeper analysis of the assumptions of the Hepler theory leads to the conclusion that for most cases the entropy contributions to the substituent effect cannot be neglected. Hence a limitation of the Hepler theory is apparent.
T. M. Krygowski, J. Guilleme and B. Wojtkowiak, J. Chem. Soc., Perkin Trans. 2, 1979, 1143 DOI: 10.1039/P29790001143
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