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Half-chair conformations of unsaturated heterocyclic compounds

✍ Scribed by D. M. Fatheree; G. L. Deeg; D. B. Matthews; J. G. Russell

Book ID
102950902
Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
535 KB
Volume
18
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The vicinal proton coupling constants were obtained for some 6‐membered ring unsaturated heterocyclic compounds. The R values and ring dihedral angles were determined and found to be consistent with half‐chair conformations. Relative to saturated heterocyclic compounds, the effect of the sulfur atom on ring puckering was attenuated. However, an increase in ring puckering resulted from the sulfone group and was attributed to torsional energy.

πŸ“œ SIMILAR VOLUMES

The preferred half-chair conformation of
The preferred half-chair conformation of ring A in 5(10)-estrenes
✍ Samuel G. Levine; Dorothy M. Feigl; Nancy H. Eudy πŸ“‚ Article πŸ“… 1967 πŸ› Elsevier Science 🌐 French βš– 240 KB

We have previously (2) described an unusual type of conformational preference effect vhich vaa found to operate in ring A of some 3-substituted (-OH and -N3), A 5(10) -steroids. From the RMR spectra of these epimer pairs in the C-3 proton region, It was evident that the 3a-and