## Abstract The ^13^C chemical shift of the substituted or functionalized carbon of various medium and large rings is plotted against ring size (6β15 carbons). The curves thus obtained allow a conformational analysis of the corresponding derivatives.
Comparative 13C NMR study of the conformations of malic and thiomalic acids
β Scribed by Victor M. S. Gil
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 252 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
Vicinal and geminal ^13^CO~2~Hο£Ώ^1^H coupling constants are reported for malic and thiomalic acids at various pH values and related, in a comparative manner, to the known conformational information obtained by ^1^H NMR.
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In aqueous solutions, 13C-and 'H-nmr studies show that the percentage of trans conformation of proline oligomers +H\*N Pro-(Pro),-CO; increases substantially from n = 1 (65% trans) t o n = 2 (90% trans). The relatively low percentage of trans structure for the dimer ( n = 1) very likely is caused by
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