## Abstract ^13^C n.m.r. chemical shifts and one bond ^13^C, ^1^H coupling constants for cyclopropene and its 1‐ and 3‐methyl derivatives as well as for methyl cyclopropane have been measured. The data for cyclopropene are 108·9 ppm and 228·2 Hz, 2·3 ppm and 167·0 Hz in the olefinic and allylic pos
13C n.m.r. spectra of quercetin and rutin
✍ Scribed by J. Y. Lallemand; M. Duteil
- Publisher
- John Wiley and Sons
- Year
- 1977
- Tongue
- English
- Weight
- 136 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
The noise‐decoupled and gated‐decoupled ^13^C n.m.r. spectra of quercetin and rutin are studied and assignments are proposed. The previous assignments of carbons 2 and 4′, carbons 5 and 9, carbons 6 and 8 have been reversed.
📜 SIMILAR VOLUMES
## Abstract Carbon‐13 n.m.r. spectra of formic, acetic, propionic and butyric acid amides with __N__,__N__‐di‐__n__‐alkyl substituents have been completely assigned with the aid of extensive double resonance experiments. The data obtained were used to study long range steric effects on chemical and
## Abstract ^13^C n.m.r. chemical shifts and carbon‐proton coupling constants of 2‐substituted pyrimidines are reported. The carbon chemical shifts are correlated with π‐electron densities. Substituents which cause deshielding at the directly bound carbon (e.g. NH~2~, OCH~3~ and F) exert a more pow
## Abstract Correction of measured chemical shifts by subtracting the diamagnetic contributions caused by certain substituents on various carbons of a molecule leads to data that allow a reasonable interpretation of substituent effects on chemical shifts in ^13^C n.m.r. spectroscopy. It is shown th
## Abstract ^13^C n.m.r. spectra of a series of __N__,__N__‐disubstituted thioamides have been recorded and signal assignments were performed. Separate signals are observed for methylene groups fixed on the nitrogen atom. Since the carbon atom __syn__ to the thiocarbonyl sulfur resonates at higher