The activation parameters for the syn–anti-isomerization of several N-alkyl and N-fluoroalkylimines of hexafluoroacetone have been obtained by dynamic 19F n.m.r. spectroscopy and have been interpreted in terms of steric effects, rather than negative hyperconjugation.
W. H. Dawson, D. H. Hunter and C. J. Willis, J. Chem. Soc., Chem. Commun., 1980, 874 DOI: 10.1039/C39800000874
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