𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Studies of substituent effects by carbon-13 NMR spectroscopy. VI—Application of multivariate data analysis to 13C NMR chemical shifts of protonated chalcones and thiophene chalcone analogues

✍ Scribed by Giuseppe Musumarra; Domenica Carbone; Dan Johnels; Ulf Edlund


Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
517 KB
Volume
24
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.


📜 SIMILAR VOLUMES


Studies of substituent effects by carbon
✍ Giuseppe Musumarra; Francesco P. Ballistreri 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 686 KB

## Abstract ^13^C NMR spectra of 39 thiophene and furan chalcone analogues in CDCl~3~ solutions are reported. The effect of substituents on the ^13^C chemical shifts in the phenyl and in the 5‐membered rings is discussed. ^13^C NMR shifts are correlated with Hammett parameters and with experimental

Application of principal component analy
✍ Giuseppe Musumarra; Svante Wold; Salo Gronowitz 📂 Article 📅 1981 🏛 John Wiley and Sons 🌐 English ⚖ 461 KB

## Abstract ^13^C NMR shifts of 54 chalcones and their thiophene and furan analogues are analyzed by principal component analysis. Thus, a mathematical model is derived for the variation of the carbon shifts in each of seven classes. Two component models are found to be adequate by cross‐validation

Identification of C-glycopyranosides and
✍ Brian Wright; Leslie R. Hughes; Sheila S. Qureshi; Alan H. Davidson 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 471 KB

Box 13, Cardiff CF1 3XF, UK C-Glycopyranosides and C-glycofuranosides were identilied using 'jC and 'H chemical shift and coupling constant data. Full assignments for all a-and gaoomers were made possible by recourse to carboeproton chemical shift correlation spectroscopy. Greater steric shielding e