Photocycloaddition of 2-(1-alkynyl)cyclohexenones 1 and 2 with alkenes 3 and 4 furnishes tetrasubstituted furans 5–8 as the only isolated products; a suggested mechanism leads from the alkyl propynyl biradical 12 to carbene 13, which then closes to the furan.
P. Margaretha, S. Reichow and W. C. Agosta, J. Chem. Soc., Chem. Commun., 1992, 797 DOI: 10.1039/C39920000797
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