The benzyl cycloalk-1-enyl ketones (I)–(III) cyclise photochemically via singlet and triplet excited states to give the products (V)–(VII) in MeOH with and without CF3CO2H, in benzene with BF3-Et2O or CF3CO2H, and in MeCN with and without CF3CO2H.
M. Tada, H. Saiki, K. Miura and H. Shinozaki, J. Chem. Soc., Chem. Commun., 1975, 55 DOI: 10.1039/C39750000055
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