## 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
(MM2) theoretical conformational analysis of seven-membered rings (IV)1: thiepane and 1,4-oxathiepane
✍ Scribed by A. Espinosa; M.A. Gallo; A. Entrena; J. Campos; J.F. Domínguez; E. Camacho; I. Sánchez
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 915 KB
- Volume
- 296
- Category
- Article
- ISSN
- 0022-2860
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract The 12__H__‐dibenzo [__d__, __g__] dioxathiocines 2 and 4 are prepared by condensation of the corresponding bis[phenols] 1 and 3 with SOCl~2~ and SCl~2~, respectively. X‐Ray analysis reveals the presence of the boat‐chair (__BC__) form as the only conformer in the solid state of the cyc
1,2-Bis(1,2,4-triazole-1-yl)ethane (BTE) was prepared and its crystal structure has been investigated by X-ray analysis. The compound crystallizes in monoclinic space group P2 1 =a with a ¼ 6:805ð3Þ; b ¼ 8:836ð3Þ; c ¼ 6:646ð2Þ A; b ¼ 112:114ð7Þ8; V ¼ 370:2ð2Þ A 3 ; Z ¼ 2; and D ¼ 1:473 Mg=m 3 : The
## 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^
## Abstract 2‐Oxo‐1,3,2‐dioxathiepanes and 3‐oxo‐2,4,3‐dioxathiepins, including two series of three diastereoisomers, were synthesized, isolated by HPLC and characterized by ^1^H and ^13^C NMR spectroscopy. Their conformational behaviour was studied using a computer‐assisted LIS technique and, for