✦ LIBER ✦
15N chemical shifts as a conformational probe in enaminones A variable temperature study at natural isotope abundance
✍ Scribed by L. Kozerski; W. von Philipsborn
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 365 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The high sensitivity of ^15^N shielding to the displacement of the lone pair electrons makes it a useful conformational probe for remote parts of a conjugated molecule. Thus, the chemical shifts are observed for different rotamers of enaminones in the slow exchange limit. The interpretation of the ^15^N chemical shifts in terms of the non‐planarity of the E, s‐E rotamers is in accord with ^13^C chemical shifts and ^1^J(CH) coupling constants.