Racemisation rates for the indenes (1) provide migratory aptitudes for acyl, vinyl, ethynyl, nitrile, and alkyl groups, as well as hydrogen; it is proposed that the fast migration of formyl, acetyl, and benzoyl groups is, at least in part, due to a secondary interaction involving the carbonyl π* orbital.
D. J. Field, D. W. Jones and G. Kneen, J. Chem. Soc., Chem. Commun., 1976, 873 DOI: 10.1039/C39760000873
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