𝔖 Bobbio Scriptorium
✦   LIBER   ✦

The 13C,H coupling constants in structural and conformational analysis. IV–The rotational dependence of the long-range CH couplings of the aldehyde and hydroxyl protons in salicylaldehyde

✍ Scribed by Pertti Äyräs; Reino Laatikainen; Simo Lötjönen

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
360 KB
Volume
13
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The proton‐coupled ^13^C NMR spectrum of salicylaldehyde was analysed. The second‐order character of the seven independent sub‐spectra allowed the signs of most of the couplings to be determined. The input values for the analyses were obtained from the known J(CH) values of benzene, phenol and benzaldehyde using the additivity principle. In most instances, very good agreement between the calculated and observed values was obtained. Significant couplings of the ring carbons to both the aldehyde and hydroxyl protons were also observed. The magnitude of these couplings was very dependent on the stereochemical relationships between the coupled nuclei.

📜 SIMILAR VOLUMES

The 13C, H coupling constants in structu
The 13C, H coupling constants in structural and conformational analysis. III.. Long-range carbon–hydroxyl proton couplings as evidence of hydrogen bonding in some acylphloroglucinols
✍ Pertti Äyräs; Carl-Johan Widén 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 367 KB 👁 1 views

## Abstract Proton coupled ^13^C NMR spectra have been recorded for some acylphloroglucinol derivatives. Significant couplings over two, three and four bonds were observed between the hydroxyl proton and aromatic carbons for those compounds where the hydroxyl group is hydrogen bonded strongly enoug

Studies of 13CH coupling constants: III—
Studies of 13CH coupling constants: III—the conformational dependence of 1J(13CH) for the formyl proton in aromatic aldehydes
✍ D. F. Ewing 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 282 KB

## Abstract ^1^__J__(^13^CH) and ^2^__J__(^13^CH) involving the aldehydic proton in __ortho__‐alkylbenzaldehydes have been examined for evidence of a hyperconjugative contribution from the aromatic π‐electrons. The expected hyperconjugative effect is obscured by changes in the coupling constants re

The structural dependence of vicinal 13C
The structural dependence of vicinal 13C13C coupling constants in s-cis-butane and cis-butane
✍ Martin Klessinger; Jung-Hyuck Cho 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 English ⚖ 193 KB

The dependence of three-bond "GUC couplings of cis-butane and cis-butene on the valence angle, the torsional angle of the methyl groups and methyl and methylene substituents is discussed on the basis of INDO-SCPT calculations. The results support the interpretation of the experimental couplings betw

The 13C,H coupling constants in structur
The 13C,H coupling constants in structural and conformational analysis: II The correlation of 3J(HCCH) and 3J(CH3CCH) in ethylenes and their methyl derivatives
✍ Pertti Äyräs 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 182 KB 👁 1 views

## Abstract The vicinal ^3^__J__(CH~3~CCH) coupling constants were determined for a number of propylene derivatives and compared with the ^3^__J__(HCCH) couplings of the corresponding ethylenes. A linear regression analysis yielded the correlation ^3^__J__(CH) = 0.46 ×^3^ __J__(HH)+1.58 Hz, the c

Assignment of indirect 13C, 1H couplings
Assignment of indirect 13C, 1H couplings in the 13C NMR spectra of some purine and pyrimidine nucleosides and their analogues by long-range selective 1H decoupling
✍ Jun Uzawa; Masakazu Uramoto 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 330 KB

## Abstract The assignments of the long‐range ^13^C, ^1^H coupling constants in the ^13^C NMR spectra of the base moieties of several purine and pyrimidine nucleosides and their analogues were established by the application of long‐range selective ^1^H decoupling with low‐power ^1^H irradiation. Th