Room-temperature irradiation of 4,4-diphenyl- and 4-methyl-4-phenyl-cyclopentenone led very efficiently to keten rearrangement products [e.g.(4)] rather than bicyclic ketones [e.g.(6)] characteristic of cyclohexenone photochemistry; at low temperatures the bicyclic ketone primary product underwent further photochemical reaction to give the keten, but the bicyclic ketone was not an intermediate at room temperature.
H. E. Zimmerman and R. D. Little, J. Chem. Soc., Chem. Commun., 1972, 698b DOI: 10.1039/C3972000698B
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