## Abstract The ^17^O NMR chemical shifts of five enriched amino acids have been measured under strictly controlled conditions of concentration, ionic strength, pH and temperature. The Ξ±, Ξ² and Ξ±, Ξ³ carboxyl resonances of aspartic and glutamic acid, respectively, have been resolved. Line widths wer
33S and 17O nuclear magnetic resonance studies of aqueous methanesulfonic and trifluoromethanesulfonic acids
β Scribed by Telitha M Murray; David S Crumrine
- Publisher
- Elsevier Science
- Year
- 1991
- Weight
- 423 KB
- Volume
- 91
- Category
- Article
- ISSN
- 0022-2364
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## Abstract ^17^O chemical shifts of four amino acids at natural abundance have been obtained. Sensitivity was enhanced by accumulating a large number of scans or employing high concentrations at elevated temperature. Routine memory overflow was avoided by using a combination of solvent suppression
## Abstract ^33^S NMR spectra have been obtained in the FT mode for some sulphones and sulphonic acids. The investigated compounds show narrow resonance lines. In the case of sulphones, the range of ^33^S chemical shifts is sufficiently wide, i.e. the effects due to changes in substituents are sign
%S and I4N NMR spectra of nine sulphnr-nitrogen compounds are reported. It is demonstrated that "N NMR gives high signal-to-noise spectra with good discrimination of chemical shifts. It is concluded that both I4N and "S NMR can make a useful contribution to the study of sulphur-nitrogen chemistry an