𝔖 Bobbio Scriptorium
✦   LIBER   ✦

13C NMR chemical shift substituent effects. 4–α-monosubstituted acetones

✍ Scribed by Roberto Rittner; José A. Vanin; Blanka Wladislaw

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
301 KB
Volume
26
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

NMR chemical shifts for some a-heterosubstituted acetones were recorded. The carbonyl carbon shieldings are discussed in the light of the substituent electronic effects and were also empirically estimated by Tanaka et d ? s equation. An approximate linear relationship was observed between the I3C and "O chemical shifts. A nonadditivity of substituent chemical shifts was observed for the a-methylene carbon, and attributed to intramolecular interactions between the a-heteroatom and the carbonyl group.

📜 SIMILAR VOLUMES

13C NMR chemical shift substituent effec
13C NMR chemical shift substituent effects. 5—α-Monosubstituted N,N-diethylacetamides
✍ Roberto Rittner; Marcos A. P. Martins; Günter Clar 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 455 KB

## Carbon -13 NMR chemical shifts of a series of a-monosubstituted N,N-diethylacetamides [YCH,C(O)NEt, , Y = Me, C1, Br, I, OMe, SMe, and NMe,] are reported. The a-methylene and carbonyl carbon chemical shifts are correlated with the Pauling electronegativities (E,) and Charton's localized electri

NMR chemical shift substituent effects:
NMR chemical shift substituent effects: 2-α-monosubstituted N,N-diethylacetamides
✍ Marcos A. P. Martins; Roberto Rittner 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 490 KB

## Abstract ^1^H NMR chemical shifts for some α‐hetero‐substituted __N__,__N__‐diethylacetamides were recorded. The resonance assignments for the __syn__‐ and __anti__‐methylene and ‐methyl protons have been made unambiguously through their aromatic solvent induced shifts and are opposed to the lit

Carbon-13 NMR chemical shift substituent
Carbon-13 NMR chemical shift substituent effects 8—3-monosubstituted 2-methylpropenes
✍ Roberto Rittner; Mara E. F. Braibante 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 407 KB

## Abstract ^13^C NMR chemical shifts for some 3‐heterosubstituted 2‐methylpropenes are reported. The α‐methylene chemical shifts show excellent linear correlations with the corresponding data for some substituted carbonyl compounds (propanones, methyl acetates and __N__,__N__‐diethylacetamides). T

Substituent effects on 1H and 13C NMR ch
Substituent effects on 1H and 13C NMR chemical shifts in α-monosubstituted ethyl acetates: principal component analysis and 1H chemical shift calculations
✍ Ljubica Tasic; Raymond J. Abraham; Roberto Rittner 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 126 KB

## Abstract A principal component analysis is applied to α‐monosubstituted ethyl acetates (YCH~2~CO~2~Et), where the observed chemical shifts for the α‐carbon atom, the carbonyl carbon, and the α‐hydrogen atoms are correlated with theoretically derived molecular properties, i.e. the partial charges

Substituent effects on the 13C NMR chemi
Substituent effects on the 13C NMR chemical shifts of 1-hydroxyalkylphosphonic acids
✍ Zdzisław Glowacki; Maria Hoffmann 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 208 KB

## Abstract ^13^C chemical shifts and ^31^P,^13^C coupling constants are reported for nine 1‐hydroxyalkylphosphonic and two additional phosphonic acids. The α‐substituent‐induced chemical shifts (α‐SCS) of the phosphonate group were calculated and their non‐additivity was observed. Good linear corr