Deuterium isotope effects on one-bond carbon, hydrogen coupling constants
β Scribed by Jeremy R. Everett
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 336 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
Small, negative deuterium isotope effects on ^1^J(CH) have been found for a variety of simple organic molecules. These new experimental data support theoretical calculations and suggestions based on previous imprecise experimental measurements. The deuterium isotope effects upon the ^13^C chemical shifts were also measured with high precision.
π SIMILAR VOLUMES
## Two new experiments for the assignment and determination of 1J(13C,'3C) coupling constants of H-C-C fragments at natural isotope abundance are presented which exploit proton equilibrium polarization and proton signal intensity. The first experiment, which represents a J-resolved modification of
## Abstract A series of intramolecularly hydrogenβbonded enamines, enols and enethiols with ester carbonylic, ketonic carbonylic, thioester carbonylic, nitro and sulphoxide acceptors were investigated to obtain ^13^C chemical shifts and deuterium isotope effects. Results from 33 new compounds and s
Primary p\*J(13C,H) and secondary s\*J(13C,H) isotope e β ects on carbonΓproton coupling constants were measured in studies of proton-and deuteron-coupled 13C NMR spectra of the halomethanes CH n D m X 4~n~m , where X is Cl, Br or I. Both e β ects are always negative. The magnitudes of p\*J(13C,H) inc