Only the intramolecular [2 + 2] cycloaddition to give the oxetanes 2 was hitherto known as a photoreaction for ketones of the type 1. However, under certain conditions a photoisomerization to give the compounds 3 is also possible. This reaction proceeds through a novel non-allylic 1,3 shift of an acyl group with the formation of a strained ring framework. Substituents include, for example, A = H; B, C = (CH2)4; R = Me.
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Leitich et al. (1993) studied this question.
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