The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study
In this work, several features of the polar bond-polarizable bond interaction are studied using an experimental and theoretical methodology. The NMR 13C chemical shifts for 1-CN,2-OCH3-naphthalene, 1-CHO,2-OCH3-naphthalene and 5-Cl,6-OCH3,8-NH2-quinoline were measured. In these three compounds, ster...
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2000
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paper:paper_00222860_v556_n1-3_p263_Contreras2023-06-08T14:48:56Z The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study Contreras, Rubén Horacio Peralta, Juan Ernesto Chemical shifts Electrostatic response Intramolecular interactions Methoxy group NMR carbon chemical compound chlorine methoxynaphthalene methyl group naphthalene derivative quinoline derivative unclassified drug article calculation chemical binding chemical interaction chemical structure electricity electron magnetism molecular physics polarization proton nuclear magnetic resonance stereochemistry In this work, several features of the polar bond-polarizable bond interaction are studied using an experimental and theoretical methodology. The NMR 13C chemical shifts for 1-CN,2-OCH3-naphthalene, 1-CHO,2-OCH3-naphthalene and 5-Cl,6-OCH3,8-NH2-quinoline were measured. In these three compounds, steric interactions force the methoxy group to be oriented cis to the adjacent C-C bond with the smaller π mobile bond order. GIAO DFT-B3LYP/6-311G** magnetic shielding calculations were performed on such compounds, on their corresponding monosubstituted analogs, and on model systems that intend to mimic the electrostatic response of a naphthalene substrate to a polar group. Effects of σ electron delocalization interactions on the methoxy 13C chemical shift are studied separately using the NBO approach. Failure of the level of theory employed to describe some 13C chemical shifts in the chlorine-containing compound are rationalized in terms of contributions from the spin orbit interaction. The model compounds studied in this work shed light on the influence of the double bond character on the PB-PzB interaction. Aromatic 13C chemical shifts were proven to be sensitive probes to measure such interaction, which can be thought of as the π electrostatic response to a proximate polar moiety, causing a shielding effect on the carbon atom nearest to the positive end of the polar group. © 2000 Elsevier Science B.V. Fil:Contreras, R.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Peralta, J.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222860_v556_n1-3_p263_Contreras http://hdl.handle.net/20.500.12110/paper_00222860_v556_n1-3_p263_Contreras |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Chemical shifts Electrostatic response Intramolecular interactions Methoxy group NMR carbon chemical compound chlorine methoxynaphthalene methyl group naphthalene derivative quinoline derivative unclassified drug article calculation chemical binding chemical interaction chemical structure electricity electron magnetism molecular physics polarization proton nuclear magnetic resonance stereochemistry |
| spellingShingle |
Chemical shifts Electrostatic response Intramolecular interactions Methoxy group NMR carbon chemical compound chlorine methoxynaphthalene methyl group naphthalene derivative quinoline derivative unclassified drug article calculation chemical binding chemical interaction chemical structure electricity electron magnetism molecular physics polarization proton nuclear magnetic resonance stereochemistry Contreras, Rubén Horacio Peralta, Juan Ernesto The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study |
| topic_facet |
Chemical shifts Electrostatic response Intramolecular interactions Methoxy group NMR carbon chemical compound chlorine methoxynaphthalene methyl group naphthalene derivative quinoline derivative unclassified drug article calculation chemical binding chemical interaction chemical structure electricity electron magnetism molecular physics polarization proton nuclear magnetic resonance stereochemistry |
| description |
In this work, several features of the polar bond-polarizable bond interaction are studied using an experimental and theoretical methodology. The NMR 13C chemical shifts for 1-CN,2-OCH3-naphthalene, 1-CHO,2-OCH3-naphthalene and 5-Cl,6-OCH3,8-NH2-quinoline were measured. In these three compounds, steric interactions force the methoxy group to be oriented cis to the adjacent C-C bond with the smaller π mobile bond order. GIAO DFT-B3LYP/6-311G** magnetic shielding calculations were performed on such compounds, on their corresponding monosubstituted analogs, and on model systems that intend to mimic the electrostatic response of a naphthalene substrate to a polar group. Effects of σ electron delocalization interactions on the methoxy 13C chemical shift are studied separately using the NBO approach. Failure of the level of theory employed to describe some 13C chemical shifts in the chlorine-containing compound are rationalized in terms of contributions from the spin orbit interaction. The model compounds studied in this work shed light on the influence of the double bond character on the PB-PzB interaction. Aromatic 13C chemical shifts were proven to be sensitive probes to measure such interaction, which can be thought of as the π electrostatic response to a proximate polar moiety, causing a shielding effect on the carbon atom nearest to the positive end of the polar group. © 2000 Elsevier Science B.V. |
| author |
Contreras, Rubén Horacio Peralta, Juan Ernesto |
| author_facet |
Contreras, Rubén Horacio Peralta, Juan Ernesto |
| author_sort |
Contreras, Rubén Horacio |
| title |
The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study |
| title_short |
The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study |
| title_full |
The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study |
| title_fullStr |
The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study |
| title_full_unstemmed |
The polar bond-polarizable bond interaction in 1-X,2-methoxy naphthalenes. An experimental and theoretical study |
| title_sort |
polar bond-polarizable bond interaction in 1-x,2-methoxy naphthalenes. an experimental and theoretical study |
| publishDate |
2000 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222860_v556_n1-3_p263_Contreras http://hdl.handle.net/20.500.12110/paper_00222860_v556_n1-3_p263_Contreras |
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| _version_ |
1768545270709092352 |