## Abstract Carbon‐13 nuclear magnetic resonance spectra of a series of __N__‐methyl‐__N__‐alkylpiperidinium salts have been measured, and the observed chemical shifts analysed in terms of the stereochemical and conformational properties of the molecules. Furthermore, the differences of the free en
Equilibria and 13CMR shifts of cyclohexane conformers
✍ Scribed by Hans-Jörg Schneider; Volker Hoppen
- Book ID
- 104234605
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- French
- Weight
- 214 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0040-4039
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📜 SIMILAR VOLUMES
The carbon-13 chemical shifts of monosubstituted cyclohexane derivatives are compared with those of aliphatic compounds. The polar substituents exert a similar influence on the M-, Band y-carbons in both series of compounds. The 8-effect is shown to be characteristic mainly to the cyclic compounds,
## Abstract The conformational equilibrium constants for a series of 1‐alkyl substituted cyclohexanols have been determined using a lanthanide shift reagent, and the results compared with other methods. In comparison to other technique greater preference is shown by the hydroxyl group for the equat
## Abstract Carbon‐13 chemical shifts of all twenty‐two dimethylcyclohexanols, formed by the hydrogenation of isomeric xylenols, have been measured and assigned. Conformational peculiarities of dimethylcyclohexanols are discussed on the basis of their carbon‐13 chemical shifts.
The effectofadjacentcarboniumion centers on the chemical shifts ofmethylgroups in the n.m.r. spectrum has been the subject of numerous studies (1,2). However, alkyl shifts in ., systems where partial. carbonic ion character has been Introduced by protonatlon of a carbowl function (e.g. I) have not b