Abstract
The effects of electronic structure and conformation of the molecules (Y = o, m, and p-Cl) and (Y′ = o, and m-Cl) have been studied in benzene between 10.0 and 70.0 °C. In the oxirane systems the conjugation between the two rings is very small, if present at all; consequently, in the absence of steric and/or electrostatic hindrance internal rotation is observed. In the cyclopropane systems examined these steric effects are sufficiently important to completely immobilise the molecular structure.

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