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NN-Dialkyl-benzoylacetamides (1a–e and j–n) and -acetoacetamides (1f–i), and N-methylbenzoylacetanilide (1o) undergo photocyclization involving δ-hydrogen abstraction by the ketone carbonyl group to give N-substituted 4-hydroxypyrrolidin-2-ones (2a–o) in high yields.
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Hasegawa et al. (1976) studied this question.
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