Abstract
Abstract The molecular structure and conformations of trans -1,2-divinylcyclopropane have been studied by the gas electron diffraction method. The experimental data are in agreement with a conformational equilibrium with 58%, anti, anti , 29% anti + gauche and 13% ±13% ± gauche , ± gauche contributions. The conformational composition is in agreement with the statistical probabilities for two independent substituent vinyl groups. The C 1 C 2 bond is found to be ca. 0.011 A longer than the other CC bonds in the cyclopropyl ring. This is in agreement with predicted ring asymmetry, treating the vinyl substituents as π acceptors.
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