The excited ketone carbonyl group in the α-alkyl β-oxoamide (1a–e) abstracts γ- and δ-hydrogen competitively from the n,π triplet state; the δ-hydrogen abstraction greatly predominates over the γ-hydrogen abstraction in the photolyses of (1c) and (1d).
T. Hasegawa, Y. Arata and K. Mizuno, J. Chem. Soc., Chem. Commun., 1983, 395 DOI: 10.1039/C39830000395
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