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The stereochemistry of the 6-membered ring of cedranone

✍ Scribed by Mario Rodríguez; José Fernández Bertrán

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
236 KB
Volume
13
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Evidence from the coupling constants and solvent shifts of the protons in cedranone rules out the boat and chair conformations of the cyclohexanone ring. Linear correlation of the solvent shifts of the C‐15 methyl protons of cedranone with those of the α‐methyl groups of fenchone indicates a nearly planar conformation of the cedranone ring. Site factor analysis of the ASIS effect of the methyl protons of cedranone provides conclusive evidence of a quasi‐chair conformation of the 6‐membered ring.

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A BONBON 6-membered ring heterocycle
A BONBON 6-membered ring heterocycle
✍ Kliegel, Wolfgang ;Preu, Lutz ;Riebe, Ulf ;Patrick, Brian O. ;Rettig, Steven J. 📂 Article 📅 2001 🏛 International Union of Crystallography 🌐 English ⚖ 205 KB

6diboratacyclohexane, C 26 H 28 B 2 N 2 O 2 , occupies a crystallographic inversion centre, and contains a six-membered BONBON heterocyclic ring, with a chair conformation and dative BÐN bonds of length 1.640 (1) A Ê .