Abstract
A theoretical study of the transition structures for the reactions of 1-methyl-2-vinylpyrrole 1 with methyl propiolate (MP) and with dimethyl acetylenedicarboxylate (DMAD) indicates that, for this vinyl system, the factor controlling the different courses of the reaction is the lower activation energy for the formation of the transition state in the second cycloaddition with MP, compared to that with DMAD.
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