## 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
Conformational analysis of benzoannulated nine-membered rings. Part 3. 1,4,5,7-Tetrahydro-3H-2,6-benzodiselenine and its 4-spiro derivatives
✍ Scribed by Barbara Rys; Helmut Duddeck; Monika Hiegemann
- Book ID
- 112130379
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1992
- Tongue
- English
- Weight
- 160 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0022-152X
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The NW? spectra of compounds l-5, recorded at different temperatures, are discussed and interpreted in terms of conformational eguilibrium. Ground state conformations are found to be chiral, ring inversion barriers are surprisingly high (ca 48 kJ/mol).
## Abstract Temperature‐dependent ^1^H and ^13^C NMR spectra of the title compounds are presented. The coalescence effects in the spectra are discussed and assigned to the racemization of the __C__~2~ symmetry conformation of the nine‐membered ring. The barrier of this process is __ca__. 64 kJ mol^
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