Abstract
AbstractThe 19F NMR spectra of mono‐ and difluoroacetamide are used to derive the activation parameters for rotation about the CN bond; it is not possible to obtain useful results for trifluoroacetamide. A total line shape analysis is used.Unusually large deuterium isotope effects upon the shielding of the 19F nucleus are observed for N‐deuterated derivatives. The magnitude of the isotope effect is different for mono‐, di‐ and trifluoroacetamides, and in the mono‐deuterated species the isotope effect is different for cis and trans rotational isomers.
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