5-Oxabicyclo[2,1,1]hexan-2-ones are formed on photolysis of both βγ- and γδ-unsaturated acyclic 1,2-diketones, the formation from the latter involving an initial migration of the double bond via a cyclobutanol intermediate.
R. Bishop and N. K. Hamer, J. Chem. Soc. D, 1969, 804a DOI: 10.1039/C2969000804A
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