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.
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Margaretha et al. (1992) studied this question.
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