“syn–anti- Isomerization” of the N-heptafluoroisopropylimine of hexafluoroacetone; steric effects or negative hyperconjugation?
Abstract
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.