The products and relative rates of cycloaddition of a series of olefins and acetylenes to dimethylketen have been examined. Steric and electronic factors are in accord with a concerted reaction in which the keten adds antarafacially, with differing degrees of bond formation, at the reaction termini in the transition state.
N. S. Isaacs and P. Stanbury, J. Chem. Soc., Perkin Trans. 2, 1973, 166 DOI: 10.1039/P29730000166
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