~The 240 MHz N M R spectra of bipyrimidine in the nematic phase of p-methoxybenzylidene-p-n-butylaniline is analysed. Thepuru H,H inter-ring distance is determined. The barrier to internal rotation of the inter-ring C--C bond is studied. Excellent agreement between experimental and calculated spect
Etude RMN de l'Acetone en Solution dans une Phase Nematique
✍ Scribed by J. Courtieu; Y. Gounelle
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- English
- Weight
- 256 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
The NMR spectrum of acetone oriented in the nematic phase of butyl-p-@'-ethoxyphenyloxycarbonyl) phenyl carbonate has been studied in the 48" to 58°C temperature range. The determination of direct coupling constants allows the computation of orientation parameters; these values lead us to emphasize the intervention of polarizability in orientatior. phenomena.
R6sumC-Le spectre RMN de I'acCtone orientCe d a m le p-@-'ethoxyphenyloxycarbonyl)ph6nyi carbonate de butyle est Ctudie dans l'intervalle de ternpkrature 48' a 58°C. La mesure des constantes de couplage direct permet de calculer les facteurs d'orientation moleculaires; ceux-ci permettent de mettre en evidence ici I'intervention de la polarisabilitk dans le phenomene d'orientation.
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The chemical shifts of acetone carbons are measured in the gas phase and in nineteen solvents, thus allowing the separation of the screening constant terms arising from the different kinds of solutesolvent interactions. It is shown that for methyl carbons the van der Weals term a , , interpreted'usi
## Abstract Les spectres RMN du benzimidazole, de l'indazole, du phényl‐1 imidazole, du phényl‐1 pyrazole et de certains de leurs dérivés méthylés, ont été étudiés dans l'acide sulfurique en vue de déterminer les couplages avec les protons portés par les azotes.