Chaleurs de Combustion de Dérivés Cyclopropaniques et Pouvoir de Conjugaison du Groupe Cyclopropyle

PJC Fierens, J Nasielski

Index: Fierens,P.J.C.; Nasielski,J. Bulletin des Societes Chimiques Belges, 1962 , vol. 71, p. 187 - 202

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Citation Number: 9

Abstract

Abstract The heats of combustion of vinyl-, ethyl-, phenyl-and cyclohexylcyclopropane have been found to be respectively 772, 8, 808, 8, 1213, 3 and 1317, 8 Kcal/mole. These results clearly indicate that the ground state of “conjugated” cyclopropane derivatives is not stabilized by resonance; this is supported by HLSP quantum mechanical calculations, which give a resonance energy of 0, 6 Kcal/mole in the case of vinylcyclopropane. The synthesis ...