𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Magnetic non-equivalence in carbinols of the general formula R1R2C(OH)CH2OR (1H and 13C NMR)

✍ Scribed by Janusz Dabrowski; Andrzej Ejchart

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
353 KB
Volume
4
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Several compounds of the general formula R'R*C(OH)CH,OR containing different geminal group systems have been investigated in proton and carbon magnetic resonances at variable temperatures. The role of steric factors, viz. of the size of substituents and the distances between different parts of the molecules, have been discussed. I N T R O D U C T I O N MAGNETIC non-equivalence of the geminal groups in NMR, this term comprising both chemical shifts, i.e. anisochronism and spin couplings, has been the subject of a number of s t ~d i e s . l * ~, ~

In the present investigation, ten compounds of general formula R1R2C(OH)CH20R containing geminal group systems situated at different distances from the chiral centre were examined in proton and carbon magnetic resonances. These compounds allowed the study of various aspects of magnetic nonequivalence.

📜 SIMILAR VOLUMES

1H and 13C NMR studies on 3-aryl-5-alkyl
1H and 13C NMR studies on 3-aryl-5-alkyl-2,4-oxazolidinediones. The magnetic non-equivalence of isomeric nuclei
✍ Siddik Içli 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 426 KB

## Abstract Magnetic non‐equivalence of diastereotopically related proton and ^13^C nuclei in enantiomeric and diastereomeric rotational isomers of 3‐aryl‐5‐alkyl‐2,4‐oxazolidinedlones has been investigated. Steric interactions between the aryl and the heterocyclic moieties of these compounds produ

Temperature and solvent variation of the
Temperature and solvent variation of the 13C and 1H NMR spectra of r-1,t-2,c-3,t-4-tetrachlorotetralin
✍ Graham A. Bowmaker; David J. Calvert; Peter B. D. de la Mare; Alan J. Jones 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 310 KB

## Abstract Vicinal coupling constants in the ^1^H and ^13^C NMR spectra of __r__‐1,__t__‐2,__c__‐3,__t__‐4‐tetrachlorotetralin change with temperature and solvent in a manner better explained by conformational equilibration than by intramolecular or solvent‐determined distortions.