The 13 C chemical shift and the anisotropy effect of the carbene electron-deficient centre : Simple means to characterize the electron distribution of carbenes
© 2019 John Wiley & Sons, Ltd.
| Publié dans: | Magnetic resonance in chemistry : MRC. - 1985. - 58(2020), 3 vom: 17. März, Seite 280-292 |
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| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2020
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| Accès à la collection: | Magnetic resonance in chemistry : MRC |
| Sujets: | Journal Article 13C chemical shift carbene electron deficiency carbenes/zwitterions nucleus-independent chemical shifts (NICS) through space NMR shieldings (TSNMRS) |
| Résumé: | © 2019 John Wiley & Sons, Ltd. Both the 13 C chemical shift and the calculated anisotropy effect (spatial magnetic properties) of the electron-deficient centre of stable, crystalline, and structurally characterized carbenes have been employed to unequivocally characterize potential resonance contributors to the present mesomerism (carbene, ylide, betaine, and zwitter ion) and to determine quantitatively the electron deficiency of the corresponding carbene carbon atom. Prior to that, both structures and 13 C chemical shifts were calculated and compared with the experimental δ(13 C)/ppm values and geometry parameters (as a quality criterion for obtained structures) |
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| Description: | Date Revised 07.02.2020 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1097-458X |
| DOI: | 10.1002/mrc.4979 |