Irradiation of 2,2-disubstituted chromenes give products derived from an o-quinoneallide intermediate, the fate of which depends on the nature of the substituent groups as well as the photolysis conditions.
A. Padwa and G. A. Lee, J. Chem. Soc., Chem. Commun., 1972, 795 DOI: 10.1039/C39720000795
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