Photo-induced cycloadditions of the tetra-substituted p-quinones duroquinone, chloranil, and 9,10-anthraquinone to diphenylketen afford two types of adducts: the 1-oxaspiro[3.5]nona-5,8-diene-2,7-diones (3) and bicyclo[4.2.0]octa-5-ene-2,4,7-triones (4).
K. Ogino, T. Matsumoto and S. Kozuka, J. Chem. Soc., Chem. Commun., 1979, 643 DOI: 10.1039/C39790000643
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