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The program PERVAL, based on an all‐valence electron perturbation treatment, is applied to the evaluation of cycloadditions of diazomethane. The reactive complexes are modeled after the ab‐initio calculated transition state for the reaction of ethylene with diazomethane. The results show the type‐I behavior of diazomethane. The reactivity of dipolarophiles in these cycloadditions is determined by CT interactions, the regioselectivity, including the electron‐rich methyl vinyl ether, is explained by non‐covalent interactions.
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Sustmann et al. (1987) studied this question.
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