Evidence is presented that photochemical ring expansion of dihydrofuran-3(2H)-ones to cyclic acetals takes place when the substitution pattern of the furanones is such that α-cleavage of the C(3)-C(4) bond occurs.
P. Yates, A. K. Verma and J. C. L. Tam, J. Chem. Soc., Chem. Commun., 1976, 933 DOI: 10.1039/C39760000933
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