There is continuing interest in the possibility of six membered rings existing in boat conformations, and the energy differences between boat and chair forms are of fundamental importance in conformational.analysis. Recently the enthalpy difference between the boat and chair forms of 1,3-dioxane ha
Conformational analysis. X. Chair-twist energy difference in 1,3-oxathianes
✍ Scribed by Pihlaja, Kalevi; Pasanen, Paavo
- Book ID
- 125898230
- Publisher
- American Chemical Society
- Year
- 1974
- Tongue
- English
- Weight
- 266 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0022-3263
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract __Trans__‐4‐__t__‐Bu‐6‐R‐1,3‐dioxanes (R = Me, Pr^i^ and __cyclo__hexyl) show temperature‐dependent values for ^2^__J__(H—2) and ^3^__J__(H—4(6), H—5) in their PMR spectra. This is the result of the presence of twist‐boat conformations. With the aid of typical limit‐values of ^2^__J__(H
Conformational ;f;ects in 1,3-dioxans and 1,3-dithianes have been recently largely elucidated. -That is why we started a systematic study of alkyl-substituted 1,3-oxathianes to compare their conformational features with those of their above-mentioned symmetric analogs. GELAN and ANTEURIS investigat
The sulfoxide group shows a lot of interesting stereochemical features (2). In thiane-l-oxide the axial conformation (62% of the mixture at -9OOC) is favored by 175 Cal/mole (2). Introduction of a 3,3-dimethyl grouping reverses this axial