## Abstract Octahydroimidazo[1,5‐__a__]pyridine is shown to preferentially adopt the __trans__‐fused ring conformation in solution at room temperature. The NMR spectra of the rotational isomers of some __N__‐acetyloctahydroimidazo[1,5‐__a__]pyridines and __N__‐acetyloctahydro‐1H‐pyrido[1,2‐__c__]py
Proton magnetic resonance studies of compounds with bridgehead nitrogen atoms—XXIII: Deformation of the piperidine ring in some bicyclic compounds possessing a bridgehead amide nitrogen atom
✍ Scribed by R. Cahill; T. A. Crabb
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 377 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Some bridgehead nitrogen compounds possessing the CH(Me)‐bridgehead NC(O) system have been synthesised and their configurations assigned. The chemical shifts of the proton geminal to the methyl group provides evidence for the existence of a deformed chair conformation for the methyl substituted ring.
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## Abstract Solvent effects on the ^1^H NMR parameters of perhydro‐oxazolo[3,4‒__a__]pyridine, perhydropyrido[1,2‒__c__]‒[1,3]oxazine and perhydrothiazolo[3,4‒__a__]pyridine derivatives are described. Particularly marked are changes in the proton‐proton geminal coupling constants of the NCH~2~O and
## Abstract __cis__(1‐H, 8a‐H)‐1‐Methylperhydro‐oxazolo[3,4‐__a__]pyridine and __cis__(1‐H, 8a‐H)‐1‐methylperhydrothiazolo[3,4‐__a__]pyridine both adopt exclusively the __trans__‐fused conformation in carbon tetrachloride solution at room temperature. Both parent unsubstituted systems exist under s
## Abstract __cis__(4‐H,11b‐H)‐4‐Aryl‐1,6,7,11b‐tetrahydro‐2__H__,4__H__‐[1,3]oxazino [4,3‐__a__]isoquinoline and the related thiazino compound preferentially adopt in solution the O (or S) inside __cis__‐conformation in contrast to __cis__(1‐H,4a‐H)‐1‐arylperhydropyrido[1,2‐__c__][1,3]oxazine whic