NN-Dibenzyl and NN-diallyl β,γ-unsaturated amides undergo cyclization on irradiation to give the corresponding pyrrolidin-2-ones via 1,6-hydrogen transfer from the singlet states. The reaction is presumed to involve charge transfer from the amide group to the excited styrene moiety.
H. Aoyama, Y. Arata and Y. Omote, J. Chem. Soc., Perkin Trans. 1, 1986, 1165 DOI: 10.1039/P19860001165
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