## Abstract ^13^C NMR chemical shifts and ^13^C๏ฃฟ^31^P couplings are reported for triphenyl phosphate and 13 alkyl derivatives. In __ortho__โalkylated materials, it is found that the upfield ฮณ shielding effect is only operative when the carbon atom, situated ฮณ to the exocyclic oxygen, bears at least
A carbon-13 nuclear magnetic resonance study of compounds substituted by a perfluoroalkyl chain
โ Scribed by M. Tordeux; J. Leroy; C. Wakselman
- Publisher
- John Wiley and Sons
- Year
- 1980
- Tongue
- English
- Weight
- 182 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
Abstract
The ^13^C NMR spectra of alkanes, alkanones and cyclohexanones substituted by perfluoroalkyl groups, R~F~, have been studied. The influence of the perfluoroalkyl group on the chemical shifts of other carbons of the molecules is the same regardless of the R~F~ chain length.
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## Abstract The ^13^C NMR spectra were determined and signals assigned to the various carbons of the alkamines veracevine, germine and zygacine derived from steroidal alkaloids of the ceveratrum class. Assignment of signals was aided by analysis of the partially relaxed spectrum of cervagenine 9,12