Photocycloaddition of ketones 1a–c with tetramethylethylene 2 furnishes tetrasubstituted furans 3a–c in isolated yields of ≈85%; a suggested mechanism for formation of 3a involves [3 + 2] cycloaddition by way of an initial biradical 5 to form an intermediate carbene 6, followed by cyclization to the furan.
A. K. Mukherjee and W. C. Agosta, J. Chem. Soc., Chem. Commun., 1994, 1821 DOI: 10.1039/C39940001821
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