17O NMR spectroscopy: Geometric effects on intramolecular hydrogen bonding in rigid carbonyl systems
✍ Scribed by A.L. Baumstark; S.S. Graham; D.W. Boykin
- Book ID
- 108382431
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- French
- Weight
- 296 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0040-4039
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## Abstract Natural abundance ^17^O NMR data for fifteen 2‐ and 4‐substituted phenols, ten 3‐and 5‐substituted 2‐hydroxybenzaldehydes and eight 3‐substituted benzaldehydes, recorded at 75°C in acetonitrile are reported. The chemical shift change due to intramolecular hydrogen bonding for the phenol
The intramolecular H-bond strength in cis-enolic forms of b-diketones was investigated. The correlations between the 'H hydroxyl proton shieldings and the chemical shifts of the "C and "0 nuclei involved in the chelate ring, and the H/D isotope shifts on the latter resonances, were determined. An in
Splittings, 6,, were observed for each carbon atom, C,, of chalcone in spectra obtained from coaxial 5 and 10 mm NMR sample tubes containing solutions equimolar in the concentration of the ketone and of TFA or TFA-d as hydrogen-bond donors, respectively. It was found that a linear expression, S,A,+x