Abstract
A correlation between the intensities of infra-red absorption associated with the ring stretching vibration of monosubstituted benzene compounds and the σ constants of the substituents has been explained in terms of a simple molecular orbital model. It is shown that the changes in π-electron distribution as a result of distortion of the ring due to vibration are closely parallel to those occurring during an early stage in a free-radical substitution reaction. The symmetry of the reaction coordinate is predicted.
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