Abstract
Taking into account the four conditions required by Mclver and Komornicki to characterize a transition state, the most convenient technique for locating the transition states of the cyclization of the carbonyl ylide CH2 O+–CH2 and of its 1,3-dipolar cycloaddition to ethylene is discussed, taken as examples for electrocyclic reactions and for cycloadditions, respectively. The strategy adopted seems to be adequate for studying any reaction.

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