The rotational barriers in bis(2,4,Ctri-tert-butylphenyl) diselenide and ditelluride have been investigated by total line-shape analysis of variabletemperature 'H NMR spectra in CFCI,-CD,CI, (85: 15). The free energies of activation, AGf,,, K, for the diselenide and ditelluride were determined to be
Hindered rotation in five-membered cyclic nitrosamines: A 13C NMR study
β Scribed by Jerome E. Haky; Joseph E. Saavedra; Bruce D. Hilton
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 442 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0749-1581
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π SIMILAR VOLUMES
Bamers to rotation about the partial double C-N' bond were determined from line shape analysis of 'H and I3C dynamic NMR spectra of N',N'-dimethyl-NZ-substituted phenylacetamidines with twelve different substituents on the phenyl ring. The values of AGGc are 51.2-58.7 kJ mol-' and the correlation wi
Rates of rotations about the C-N' partial double bond in a series of six N',N' penta-and six N',N'-hexa-methylene-Nz-substituted-phenyformamidines were determined from 13C DNMR line shape analysis. Electron accepting substituents at the phenyl ring increase the barrier to rotation, and electron don
The viscosity-dependent retarding effect of a polymeric solvent The rotational tumbling with the correlation time t c acts as on the rotation of small solute molecules is investigated by 13 C a multiplicative ''masking'' process of the intramolecular NMR relaxation measurements. It is found that the
## Abstract A combination of solidβstate ^13^C CP/MAS NMR methods was used to study the rates of rotation of the phenyl group in 3,5βdimethylβ1βphenylhexβ1βynβ3βol. The methods used were __T__~1Ο~ measurements, lineshape analysis and 2D exchange spectroscopy over the temperature range 219β284 K. Th