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
A 13C NMR study of hindered rotation in N1N1 - 3-oxapentamethylene - N2 - substitutedphenyl - formamidines
โ Scribed by Iwona Wawer
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 478 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0167-7322
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๐ SIMILAR VOLUMES
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
## Abstract ^13^C and ^15^N NMR chemical shifts were measured for __N__^1^โalkylโ__N__^2^โarylthioureas. The absence of decoalescence of the __N__^1^โalkyl group carbon signals down to 190 K, the europiumโinduced chemical shifts and the molecular mechanics calculations indicate that the preferred c
## Abstract ^13^C and ^15^N NMR spectra of eight substituted 1,2,4โtriazines were measured and assigned. The assignments of the ^13^C NMR spectra were based on the substituent chemical shifts and ^__n__^__J__(C,H) coupling constants. ^15^N NMR chemical shifts generally showing well separated ranges