## Abstract Several methyltetrahydrofurans have been studied in HSO~3~FSbF~5~SO~2~ solution. __O__‐Protonation was observed from ^1^H NMR measurements at low temperature, and the coupling constants between ^+^OH and the CH protons α to oxygen were measured from the CH signals. A conformational in
Saturated 5-membered ring conformations. 2—1H NMR study of protonated N-methylpyrrolidines
✍ Scribed by Y. Infarnet; J. C. Duplan; J. Huet
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 320 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^1^H NMR spectra of the protonated and unprotonated forms of cis‐ and trans‐N‐methylhexahydroisoindoline, of 1,3,3,4,4‐pentamethylpyrrolidine and of 1,3,3‐trimethylpyrrolidine were analyzed. The coupling constants between the NH⊕ and the CH protons α to the nitrogen allowed the study of the conformation of the cyclic systems in pseudorotation.
📜 SIMILAR VOLUMES
## Abstract Temperature‐dependent ^1^H‐ and ^13^C‐NMR spectra of the title compound are presented. Coalescence effects are discussed and assigned to two dynamic processes: (a) ring inversion of the nine‐membered ring, (b) racemization of the enantiomeric ground‐state conformations of the nine‐membe
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