✦ LIBER ✦
Barriers to rotation about CN bonds—I: Rotation about the CN bond in mono-, di- and trifluoroacetamide, and deuterium isotope effects upon 19F shielding
✍ Scribed by M. H. Pendlebury; L. Phillips
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 398 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^19^F 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 ^19^F 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.