The 13C,H coupling constants in structural and conformational analysis: II The correlation of 3J(HCCH) and 3J(CH3CCH) in ethylenes and their methyl derivatives
✍ Scribed by Pertti Äyräs
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 182 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The vicinal ^3^J(CH~3~CCH) coupling constants were determined for a number of propylene derivatives and compared with the ^3^J(HCCH) couplings of the corresponding ethylenes. A linear regression analysis yielded the correlation ^3^J(CH) = 0.46 ×^3^ J(HH)+1.58 Hz, the correlation coefficient being 0.956.
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## 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 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