The natural-abundance \({ }^{17} \mathrm{O}\) NMR spectra of 35 ozonides have been examined with the following results: Symmetrically tetrasubstituted ozonides and symmetrically disubstituted ozonides give only one signal each for the ether and the peroxide \(O\) atoms. Unsymmetrically tetrasubstitu
Natural abundance 17O NMR spectra of some sulphinylimines and isocyanates
✍ Scribed by C. O. Della Vedova; H. Duddeck; H.-W. Praas
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 190 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The ^17^O chemical shifts of nine sulphinylimines and isocyanates are reported and discussed in terms of electronic and mesomeric effects. Unusually large values were found for the sulphinylimines. The differences in acyl fluorides compared with acyl chlorides are rationalized on the basis of a mesomeric form, implying an increase of the carbonyl bond order.
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## Abstract The ^17^O NMR data of thio analogues of chromanones, chromones, flavanones and flavanones are compared with those of corresponding oxygen analogues. Substituent effects are discussed in terms of steric and electronic interactions and also the conformational behaviour of some substituent
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## Abstract Complexation between crown ethers 12C4, 15C5, 18C6 and cryptand 222, and alkali cations Li^+^, Na^+^, K^+^ in various solvents were studied by ^17^O‐NMR. spectroscopy. Small diamagnetic shifts arising from the cation electric field are observed. They increase according to the sequence K