𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Studies of substituent effects by carbon-13 NMR spectroscopy. Thiophene and furan chalcone analogues

✍ Scribed by Giuseppe Musumarra; Francesco P. Ballistreri


Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
686 KB
Volume
14
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis


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 shifts in the chalcone series.


📜 SIMILAR VOLUMES


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

Investigation of substituent effects on
✍ E. Solčániová; S. Toma; A. Fiedlerová 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 414 KB 👁 1 views

## Abstract The transmission of electronic effects across the ferrocene analogues of chalcones [3‐aryl‐1‐ferrocenyl‐2‐propene‐1‐ones (series 1) and 1‐aryl‐3‐ferrocenyl‐2‐propene‐1‐ones (series 2)], as well as the conformations of both types of ferrocene analogues have been studied. The ferrocene an

Studies of substituent effects by carbon
✍ Francesco A. Bottino; Giuseppe Musumarra; Zvi Rappoport 📂 Article 📅 1986 🏛 John Wiley and Sons 🌐 English ⚖ 528 KB

13C NMR shifts for ethyl (E)-(a-cyano)cinnamates, (E)-(a-cyano)cinnamamides and ethyl (a-ethoxycarbony1)cinnamates of general formula XC6&CH=CR'RZ (R' = CN, Rz = COOEt; R' = CN, R2 = CONH,; R' = R2 = COOEt; X =p-NMe,, p-OH, p-OMe, p-Me, H, p-Br, p-C1, p-NO,, rn-CI, rn-NO,, o-OMe, 043, o-NO,) in DMSO

Carbon-13 NMR studies of nitrogen compou
✍ Jeanine Llinarés; José Elguero; Robert Faure; Emile-Jean Vincent 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 338 KB

## Abstract ^13^C NMR chemical shifts are reported for several alkyl or aryl amines, acetamides, diacetamides and ammonium and trimethylammonium salts. Substituent effects, determined with respect to chemical shifts of amino derivatives, are rationalized in terms of γ effects, steric interactions a

Carbon-13 NMR studies of 1-aryl-3-phenyl
✍ Lawrence D. Colebrook; Mohammad A. Khadim 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 401 KB

## Abstract Characteristic ^13C^ chemical shift ranges and substituent shifts of heterocyclic ring carbon atoms have been identified for a number of 1‐aryl‐3‐phenyl‐2‐thioxo‐4‐imidazolidinones. ^13^CNMR spectra may be used to detect slow internal rotation about the aryl CN‐1 bond in compounds with