Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols
The 13C chemical shifts of nine 2-X-substituted phenetol derivatives were measured together with the 13C chemical shifts of the corresponding X-monosubstituted benzenes. Using an additivity scheme, the ethoxy cis-and trans-ortho-SCSs (substituent chemical shifts) at C-6 and C-2, respectively, were d...
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todo:paper_07491581_v35_n6_p351_DeKowalewski2023-10-03T15:39:24Z Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols De Kowalewski, D.G. Kowalewski, V.J. Botek, E. Contreras, R.H. Facelli, J.C. 13c chemical shifts 13c nmr Conformational effects NMR The 13C chemical shifts of nine 2-X-substituted phenetol derivatives were measured together with the 13C chemical shifts of the corresponding X-monosubstituted benzenes. Using an additivity scheme, the ethoxy cis-and trans-ortho-SCSs (substituent chemical shifts) at C-6 and C-2, respectively, were determined to be shielding effects of 16.5 and 10.9 ppm, respectively, which are close to those determined previously in anisole derivatives. Optimized geometries at the Hartree-Fock level employing a D95** basis set for three different phenetol conformers were obtained and the corresponding chemical shifts of all 13C nuclei were calculated using the same basis set and the CHF-GIAO approach. Results are discussed in terms of different interactions defining different conformations, particularly that between a polar bond and a proximate highly polarizable one. Fil:Kowalewski, V.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Botek, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Contreras, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Facelli, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07491581_v35_n6_p351_DeKowalewski |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
13c chemical shifts 13c nmr Conformational effects NMR |
spellingShingle |
13c chemical shifts 13c nmr Conformational effects NMR De Kowalewski, D.G. Kowalewski, V.J. Botek, E. Contreras, R.H. Facelli, J.C. Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
topic_facet |
13c chemical shifts 13c nmr Conformational effects NMR |
description |
The 13C chemical shifts of nine 2-X-substituted phenetol derivatives were measured together with the 13C chemical shifts of the corresponding X-monosubstituted benzenes. Using an additivity scheme, the ethoxy cis-and trans-ortho-SCSs (substituent chemical shifts) at C-6 and C-2, respectively, were determined to be shielding effects of 16.5 and 10.9 ppm, respectively, which are close to those determined previously in anisole derivatives. Optimized geometries at the Hartree-Fock level employing a D95** basis set for three different phenetol conformers were obtained and the corresponding chemical shifts of all 13C nuclei were calculated using the same basis set and the CHF-GIAO approach. Results are discussed in terms of different interactions defining different conformations, particularly that between a polar bond and a proximate highly polarizable one. |
format |
JOUR |
author |
De Kowalewski, D.G. Kowalewski, V.J. Botek, E. Contreras, R.H. Facelli, J.C. |
author_facet |
De Kowalewski, D.G. Kowalewski, V.J. Botek, E. Contreras, R.H. Facelli, J.C. |
author_sort |
De Kowalewski, D.G. |
title |
Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
title_short |
Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
title_full |
Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
title_fullStr |
Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
title_full_unstemmed |
Experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
title_sort |
experimental and theoretical study of the ethoxy group conformational effect on 13c chemical shifts in ortho-substituted phenetols |
url |
http://hdl.handle.net/20.500.12110/paper_07491581_v35_n6_p351_DeKowalewski |
work_keys_str_mv |
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