The relationships between 13 C NMR chemical shifts of aromatic carbons and the inter-ring torsion angles (ร) of two phenyl rings in biphenyl and its substituted derivatives were systematically examined. The chemical shifts of C1, C2 and C6 carbons (ฯ C1 , ฯ C2 and ฯ C6 ) of the biphenyl group in the
The use of the furfural conformational equilibrium as a precise temperature probe in 13C NMR
โ Scribed by Suzanne Combrisson; Thierry Prange
- Publisher
- Elsevier Science
- Year
- 1975
- Weight
- 156 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0022-2364
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The conformational analysis of short polymer chains involves the use of statistical models, and their predictions must be checked against experimental information. Ytterbium-induced shifts in the "C NMR spectra of fatty acids provide a non-perturbing, straightforward method of simultaneously obtaini
The 13C NMR spectra of diterpenic derivatives having pimarane, isopirnarane and the (13s) rosane skeleton have been recorded. This analysis has shown that the chemical shift of the 19-CH3 group depends on the position of the tetrasubstituted double bond in these skeletons. The C-19 methyl group can
that the solvent tetralin may undergo a number of reactions other than simple donation of hydrogen to produce naphthalene. Previous studies",", concerned only with the reactions of the tetralin, have not reported compounds of these types, and thus the possibility that they are derived from the coal
## Abstract ^13^C NMR contact shifts induced by the 2,2,6,6,โtetramethylpiperidine nitroxide radical (TMPN) were measured for __N__,__N__โdimethylโ__para__โsubstituted benzamides and __N__,__N__โdimethylโฮฒโbromoโ and โฮฑ,ฮฒโmethylacrylamides. The shifts were linear functions of radical concentration,
The ion pairs of indenyl-lithium and -sodium in dimethosyetbane have been investigated by 13C NirlR as a function of temperature. The results are in liie with optical absorption measurements on these systems. Furthermore, they support the interpretation of the temperature dependence of the 'H chemic