Long-range coupling constants, "J(C, H), involving the formyl proton or carbon and the carbons or protons of the heterocyclic ring, were measured in the two isomeric formyl-furans and -thiophenes by employing coupled 13C NMR spectra. In furan-2-carboxaldehyde these coupling constants, obtained in so
LONG RANGE C-H COUPLING IN CONFORMATIONAL ANALYSIS
✍ Scribed by Douglas E. Dorman
- Book ID
- 114880182
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 415 KB
- Volume
- 222
- Category
- Article
- ISSN
- 0890-6564
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## Abstract Proton coupled ^13^C NMR spectra have been recorded for some acylphloroglucinol derivatives. Significant couplings over two, three and four bonds were observed between the hydroxyl proton and aromatic carbons for those compounds where the hydroxyl group is hydrogen bonded strongly enoug
## Abstract The proton‐coupled ^13^C NMR spectrum of salicylaldehyde was analysed. The second‐order character of the seven independent sub‐spectra allowed the signs of most of the couplings to be determined. The input values for the analyses were obtained from the known __J__(CH) values of benzene,
## Abstract The preferred conformations of the methylsulphinyl group in a number of phenyl methyl sulphoxides substituted in the phenyl ring with one, two or three fluorine atoms have been studied by employing a multinuclear NMR approach. From the ^1^H, ^13^C and ^17^O chemical shifts of the methyl
Long-range heteronuclear coupling constants, 3J(C,H), were measured across glycosidic linkages in b-linked disaccharides and also for vicinally disubstituted trisaccharides. One-dimensional multiple-site 13C excitation experiments using Hadamard spectroscopy and band-selective 1H decoupling during t