Photoinduced oxygenation of epoxynaphtho-quinone (3) in benzene gave 3-acetyl-3-acetoxyphthalide (4) and 3-acetoxy-3-methylisochroman-1,4-dione (5) in good yields via the reaction of singlet oxygen with a transient carbonyl ylide.
K. Maruyama, A. Osuka and H. Suzuki, J. Chem. Soc., Chem. Commun., 1980, 723 DOI: 10.1039/C39800000723
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