✦ LIBER ✦
Downfield γ-gauche and γ-antiperiplanar effects on 13C NMR chemical shifts exerted by thiophene sulphur
✍ Scribed by J. W. de Haan; M. E. van Dommelen; L. J. M. van de Ven; A. Corvers
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 299 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The γ‐effects of sulphur on ^13^C NMR chemical shifts have been measured in a series of steroidal compounds containing the thiophene ring in different configurations with respect to the rest of the molecule. The data constitute the first example of downfield effects exerted by sulphur on both gauche and antiperiplanar γ‐carbons. The γ‐gauche effect of sulphur amounts to 1.6–1.8 ppm, the γ‐antiperiplanar effect from practically zero to almost 1 ppm.