## Abstract ^13^C NMR spectra of 11 di‐, tri‐ and tetra‐__tert__‐butyl‐substituted cyclopentadienones are discussed with respect to charge distribution and substituent effects. The chemical shifts of the unsubstituted cyclopentadienone, calculated from substituent increments, are in good agreement
Synthesis and 13C-NMR spectroscopic investigations of rhamnobioses
✍ Scribed by András Lipták; Pál Nánási; András Neszmélyi; Hildebert Wagner
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- French
- Weight
- 732 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract NMR spectroscopic studies are undertaken with derivatives of 2‐pyrazinecarboxylic acid. Complete and unambiguous assignment of chemical shifts (^1^H, ^13^C, ^15^N) and coupling constants (^1^H,^1^H; ^13^C,^1^H; ^15^N,^1^H) is achieved by combined application of various 1D and 2D NMR spe
A complete, unambiguous assignment of all the 13C signals of cellobiose and maltose has been achieved using methods such as selective proton decoupling, 13C selective spin labeling, and isotopic chemical shift induced by deuterium. The chemical-shift variation of the 13C signals with the degree of p
By means of alkaline extraction of the cell walls of the yeasts Saccharomyces cermisiue and Candida albicans, water-insoluble glucans were obtained. Methylation analysis and 13C-nmr investigation in dimethyl sulfoxide solution revealed the similar chemical structure of these glucans, being composed
## Abstract ^1^H and ^13^C NMR chemical shifts are reported for several rhamnobioses and their acetylated derivatives. The effect of substitution on the rhamnose unit has been determined with respect to the anomeric carbons and linked carbons. These effects have been rationalized and have allowed t