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
Solvent effect on the 13C and 15N NMR chemical shifts and rotational barriers in N,1N1-dimethyl-and N,1N1-hexamethylene-N2 -phenylformamidines
β Scribed by Iwona Wawer
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 576 KB
- Volume
- 27
- 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
## Abstract ^13^C and ^15^N NMR chemical shifts were measured for __N__^1^βalkylβ__N__^2^βarylthioureas. The absence of decoalescence of the __N__^1^βalkyl group carbon signals down to 190 K, the europiumβinduced chemical shifts and the molecular mechanics calculations indicate that the preferred c
## REFERENCE DATA carbons, for various substituent groups and positions were carried out by gated decoupling with NOE. ## RESULTS AND DISCUSSION The I3C NMR chemical shifts of the compounds are shown in Tables 123; 'J(CH) and long-range coupling constants of 2, 9, 13 and 18, measured by gated d
1H, 13C and 15N NMR spectra of the ring-substituted N-phenylglycines (1) and their ethyl esters (2) were measured in The chemical shift determinations and assignments are based on modern inverse 2D DMSO-d 6 . techniques (HMQC, HMBC). Dependences between chemical shifts and substituent constants sho