The 1 7 0 chemical shift data for a series of 2and 4-alkyl-and -aryl-substituted pyridine N-oxides, as well as those for quinoline N-oxide (13), benzocflquinoline N-oxide (14) and benzo[h]qninoline N-oxide (15) at natural abundance were measured in acetonitrile at 75ยฐC. 2-Alkyl groups cause a deshie
Steric effects in the 17O NMR spectroscopy of aromatic methyl ethers
โ Scribed by M. A. Wysocki; P. W. Jardon; G. J. Mains; E. J. Eisenbraun; D. W. Boykin
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 408 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
0 NMR spectroscopic data (natural abundance) were obtained for 19 methoxy-aromatic compounds: a series of substituted anisoles with a single ortho substituent, a series of 2,Q-disubstituted anisoles, a series of 3-substituted-1, 2-dimethoxybenzenes and three multi-substituted anisole derivatives. The chemical shifts of the highly hindered methoxy compounds are related to previously reported regiochemistry, spectroscopic results and from theoretical calculations for these compounds.
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## Abstract Natural abundance ^17^O NMR spectra were recorded for ten methoxyflavones and one flavonol. The chemical shifts are discussed in terms of steric and conformational changes. They are related to previously reported ^13^C NMR data.
## Abstract The ^1^H NMR spectra of a number of alkenes of known geometry were recorded in CDCl~3~ solution and assigned, namely ethylene, propene, 4โmethylcyclohexene, 1,4โdimethylcyclohexene, methylene cyclohexane (in CFCl~3~โCD~2~Cl~2~ at 153 K), 5โmethyleneโ2โnorbornene, camphene, bicyclopentad