The effect of self-association on the carbonyl carbon NMR screening constant is determined for 15 ketones. It is shown that the corresponding screening constant term can only be related to the dipole moment and the molecular volume both for aliphatic and alicyclic ketones. The average distance betwe
Résonance magnétique nucléaire de 13C et 17O d'éthers aliphatiques. Effets γ entre les atomes d'oxygène et de carbone
✍ Scribed by Claude Delseth; Jean-Pierre Kintzinger
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- German
- Weight
- 464 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
The ^13^C‐ and ^17^O‐chemical shifts of 31 aliphatic ethers are measured and discussed. The ^17^O‐chemical shifts of the ethers ROR′ correlate with chemical shifts for the methylene groups of the corresponding alkanes RCH~2~R′. The constant of proportionality can be related to the orbital expansion term 〈r^−3^〉~2p~. The δ~c~ for carbon atoms can also be correlated with δ~c~ for the corresponding alkanes. The origin of the correlation is discussed taking into account the conformational modifications resulting from introduction of an oxygen atom in an alkyl chain.
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311.