Irradiation of 4′,5′-dimethoxy-6,7-benztropolone methyl ether in aqueous ethanol under nitrogen yielded an isomeric tricyclic ketone. When the irradiation was carried out under oxygen, the main products were two γ-lactones. Their structures have been interrelated and the structure of one of them confirmed by the synthesis of its dihydro-derivative.
E. J. Forbes and J. Griffiths, J. Chem. Soc. C, 1966, 2072 DOI: 10.1039/J39660002072
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