The observed loss of optical activity in the pyrrolones (7), (8), and (10) formed by flash vacuum pyrolysis of the chiral substrates (5), (6), and (9) requires that a discrete intermediate is involved in the hydrogen transfer-cyclisation steps which lead to these products.
H. McNab and L. C. Monahan, J. Chem. Soc., Chem. Commun., 1987, 138 DOI: 10.1039/C39870000138
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