Photocycloaddition of p-benzoquinone to 4-methyleneoxetan-2-one derivatives affords non-regio-specific adducts: the 1,11-dioxadispiro[3.0.5.2]dodeca-6,9-diene-2,8-diones (3) and the (undetected) 1,5-dioxa-dispiro[3.1.5.1]dodeca-7,10-diene-2,9-diones (4) which decompose to give spiro[3.5]nona-5,8-diene-2,7-dione or 5-hydroxyindan-2-one.
K. Ogino, T. Matsumoto, T. Kawai and S. Kozuka, J. Chem. Soc., Chem. Commun., 1979, 644 DOI: 10.1039/C39790000644
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