Artículo
Pedersoli, S.; Dos Santos, F.P.; Rittner, R.; Contreras, R.H.; Tormena, C.F. "NMR spin-spin couplings involving nuclei in the neighborhood of a carbonyl group. 3JCH couplings in α-substituted acetamides" (2008) Magnetic Resonance in Chemistry. 46(3):202-205
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Abstract:
In this work 3JCH spin-spin coupling constants (SSCCs) for the cis- and trans-conformers for α-X-acetamides (X = F, Cl, Br and CN) (1-4) were studied in detail since they were found to be notably different for both conformers. These differences are rationalized as originating in the changes of the strong negative hyperconjugative interactions that take place within the carbonyl group. Such changes are found to depend not only on conformation, but also on solvent. For the cis-conformers there is a close proximity between the X-substituent and the in-plane oxygen lone pair of pure p character, which affects notably their respective negative hyperconjugative interactions. Both the efficiency for transmitting the Fermi contact (FC) term through the coupling pathway of 3JCH SSCCs and its potential as a probe to study the stereochemical properties of the XH 2C group are discussed. Copyright © 2008 John Wiley & Sons, Ltd.
Registro:
| Documento: | Artículo |
| Título: | NMR spin-spin couplings involving nuclei in the neighborhood of a carbonyl group. 3JCH couplings in α-substituted acetamides |
| Autor: | Pedersoli, S.; Dos Santos, F.P.; Rittner, R.; Contreras, R.H.; Tormena, C.F. |
| Filiación: | Physical Organic Chemistry Laboratory, Chemistry Institute, Campinas State University, CP. 6154, 13084-971, Campinas, SP, Brazil Department of Physics, FCEyN, University of Buenos Aires and CONICET, Ciudad Universitaria, Pabellon 1 (C1428EHA) Buenos Aires, Argentina |
| Palabras clave: | 3JCH couplings; FC transmission; Negative hyperconjugative interactions |
| Año: | 2008 |
| Volumen: | 46 |
| Número: | 3 |
| Página de inicio: | 202 |
| Página de fin: | 205 |
| DOI: | http://dx.doi.org/10.1002/mrc.2158 |
| Título revista: | Magnetic Resonance in Chemistry |
| Título revista abreviado: | Magn. Reson. Chem. |
| ISSN: | 07491581 |
| CODEN: | MRCHE |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07491581_v46_n3_p202_Pedersoli |
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Citas:
---------- APA ----------
Pedersoli, S., Dos Santos, F.P., Rittner, R., Contreras, R.H. & Tormena, C.F. (2008) . NMR spin-spin couplings involving nuclei in the neighborhood of a carbonyl group. 3JCH couplings in α-substituted acetamides. Magnetic Resonance in Chemistry, 46(3), 202-205.http://dx.doi.org/10.1002/mrc.2158
---------- CHICAGO ----------
Pedersoli, S., Dos Santos, F.P., Rittner, R., Contreras, R.H., Tormena, C.F. "NMR spin-spin couplings involving nuclei in the neighborhood of a carbonyl group. 3JCH couplings in α-substituted acetamides" . Magnetic Resonance in Chemistry 46, no. 3 (2008) : 202-205.http://dx.doi.org/10.1002/mrc.2158
---------- MLA ----------
Pedersoli, S., Dos Santos, F.P., Rittner, R., Contreras, R.H., Tormena, C.F. "NMR spin-spin couplings involving nuclei in the neighborhood of a carbonyl group. 3JCH couplings in α-substituted acetamides" . Magnetic Resonance in Chemistry, vol. 46, no. 3, 2008, pp. 202-205.http://dx.doi.org/10.1002/mrc.2158
---------- VANCOUVER ----------
Pedersoli, S., Dos Santos, F.P., Rittner, R., Contreras, R.H., Tormena, C.F. NMR spin-spin couplings involving nuclei in the neighborhood of a carbonyl group. 3JCH couplings in α-substituted acetamides. Magn. Reson. Chem. 2008;46(3):202-205.http://dx.doi.org/10.1002/mrc.2158
