## Abstract The one‐bond coupling constant ^1^__J__ ^13^CH for the halogenated carbon in α‐halogenocyclohexanones is more important when the CH bond is in the equatorial then in the axial position. When a conformational equilibrium is present, the resulting coupling is a linear function of the eq
Studies of 13CH coupling constants: III—the conformational dependence of 1J(13CH) for the formyl proton in aromatic aldehydes
✍ Scribed by D. F. Ewing
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- English
- Weight
- 282 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
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 resulting from steric inhibition of resonance.
📜 SIMILAR VOLUMES
## 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,
## Abstract The vicinal ^3^__J__(CH~3~CCH) coupling constants were determined for a number of propylene derivatives and compared with the ^3^__J__(HCCH) 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
The complete analysis of the 'H NMR spectra of [ (C,Me,)lr(glycinate)CI] and [ (C,Me,)Ir(N-methyl-g1ycinate)Clj provide information for the conformational analysis of the five-membered N-C-C-0-Ir ring. A Karplus relationship has been established for these metallacycles [ 3J(H,H) = 8.9 cos' 4 -1.0 c