A study of 5-membered ring conformations by the temperature dependence of the vicinal spin–spin coupling constants. Conformations of cis- and trans-isomers of 4-benzoylamino-3-acetoxythiophane
✍ Scribed by B. D. Lavrukhin; T. M. Filippova; E. I. Fedin
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- English
- Weight
- 603 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Conformational equilibrium in cis‐ and trans‐4‐benzoylamino‐3‐acetoxythiophanes has been analysed on the basis of the temperature dependence of the vicinal spin–spin coupling constants. The conformations of the compounds have been established. It has been shown that in problems of this kind the real accuracy of the experiments corresponds to a wide range of spin‐spin coupling constant values and differences between the conformer energies. To narrow the range, additional data have been used, such as the temperature dependence of other vicinal coupling constants in the same molecule, angular dependence of the vicinal constants, etc.