Photolysis of the cyclobutanones (5) and (6) in methanol gave the cyclic acetals (10) and (11) and the alkenes (18) and (19); irradiation of (5) and (6) in an aqueous solution gave the lactols (14) and (15), respectively, with only small quantities of the corresponding alkenes.
N. M. Crossland, D. R. Kelly, S. M. Roberts, D. P. Reynolds and R. F. Newton, J. Chem. Soc., Chem. Commun., 1979, 681 DOI: 10.1039/C39790000681
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