The unit binding energy of a monocyclic conjugated system with an infinite number of the same unit structures can be employed as the reference energy in evaluating the resonance energy of a monocyclic conjugated system with a single unit structure. The latter system may be totally asymmetric in geometry. The resonance energy is then given as the difference between the π-energy of the system with the one-unit structure and the unit binding energy of the infinitely large system. This approach is justified by the proper prediction of the resonance energies for heteroannulenes and annulenones. The HMO theory was used in its simplest form.
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Jun‐ichi Aihara (1975) studied this question.