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.
P. Margaretha, H. J. Rathjen, S. Wolff and W. C. Agosta, J. Chem. Soc., Chem. Commun., 1988, 841 DOI: 10.1039/C39880000841
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