Novel (3 + 2) photocycloadditions with 3-(1-alkynyl)cyclohexenones and tetramethylethylene

Abstract
Irradiation of 3-alkynylcyclohexenones (3) with tetramethylethylene gives rise to novel (3 + 2) cycloadducts that can be explained mechanistically in terms of closure of an initial biradical (6) to a vinyl carbene (7), followed by stabilization of the carbene.

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