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IRC calculations performed on the transition state for the formation of the vinyl ester-controlled adduct uncovered the zwitterionic intermediate (S2, 0) shown below, corresponding to the adduct formed from nucleophilic addition of the diene. The energy of this intermediate is 12.5 kcal/mol, which is 1.5 kcal/mol lower than the transition state. However, the ring-closing transition structure proceeding from this intermediate could not be found, most likely because of the near-zero activation barrier for conversion of this zwitterions to product, Diagram presented
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