oxa-di-π-methane rearrangement 

https://doi.org/10.1351/goldbook.O04359
A photochemical reaction of a β,γ-unsaturated ketone to form a saturated α-cyclopropyl ketone. The rearrangement formally amounts to a 1,2-acyl shift and 'bond formation' between the former α and γ carbon atoms.
See also: di-π-methane rearrangement
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2258 [Terms] [Paper]
Citation: 'oxa-di-π-methane rearrangement' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.O04359 RIS BibTex EndNote
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Last revised: February 24, 2014