Photoirradiation of the non-enolizable α-keto-ester (VI) in perdeuteriomethanol has shown that an intramolecular hydrogen abstraction gives the reduction product (VII), whereas an intermolecular hydrogen abstraction gives the adduct (VIII).
Y. Nakadaira, Y. Hirota and K. Nakanishi, J. Chem. Soc. D, 1969, 1469 DOI: 10.1039/C29690001469
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