A 13C NMR and AM1 study on intramolecular interactions defining the methoxy group conformation in unhindered anisole derivatives
Interactions which define the planar conformation of the methoxy group with respect to the aryl ring in methyl aryl ethers are studied by 13C NMR spectroscopy and by MO calculations at the AM1 level in a family of anisole derivatives with unhindered ortho positions. Different methoxy ortho substitue...
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1995
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| LEADER | 08517caa a22008177a 4500 | ||
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| 001 | PAPER-3749 | ||
| 003 | AR-BaUEN | ||
| 005 | 20250204093748.0 | ||
| 008 | 190411s1995 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0000961020 | |
| 030 | |a JMOSB | ||
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Biekofsky, R.R. | |
| 245 | 1 | 2 | |a A 13C NMR and AM1 study on intramolecular interactions defining the methoxy group conformation in unhindered anisole derivatives |
| 260 | |c 1995 | ||
| 270 | 1 | 0 | |m Contreras, R.H.; Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina |
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| 504 | |a Esteban, Galache, Diez, Biekofsky, Contreras, Methoxy group conformation effects on13C NMR parameters in 1-cis-methoxy- and 1-trans-methoxy-1,3-trans-butadiene (1994) Magnetic Resonance in Chemistry, 32, p. 199 | ||
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| 506 | |2 openaire |e Política editorial | ||
| 520 | 3 | |a Interactions which define the planar conformation of the methoxy group with respect to the aryl ring in methyl aryl ethers are studied by 13C NMR spectroscopy and by MO calculations at the AM1 level in a family of anisole derivatives with unhindered ortho positions. Different methoxy ortho substituent chemical shifts were found and they were ascribed to different populations of the two coplanar conformers of the methoxy group. Optimized geometries, total energies, total point-charge dipole moments and II bond orders of the aromatic CC bonds for both methoxy rotamers of each of these compounds were calculated. Results suggest that the different populations of both types of rotamer arise from an electrostatic interaction between the side-chain dipole moment and an opposite dipole moment induced on the II electronic system of the aromatic CipsoCortho bond oriented s-cis to the methyl moiety of the methoxy group. The strength of this interaction depends on the II bond order of that bond. The failure of the AM1 method to describe quantitatively the energy of this interaction is discussed. © 1995. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: National Council for Scientific Research | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: Grants from the Argentine National Research Council (CONICET) and the University of Buenos Aires are gratefully acknowledged. We thank Lic Maria Cristina Tettamanzi for obtaining the NMR spectra. | ||
| 593 | |a PROPLAME-CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactus y Naturales, Argentina | ||
| 593 | |a Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellon 1, Ciudad Universitaria, 1428 Buenos Aires, Argentina | ||
| 700 | 1 | |a Pomilio, A.B. | |
| 700 | 1 | |a Aristegui, R.A. | |
| 700 | 1 | |a Contreras, Rubén Horacio | |
| 773 | 0 | |d 1995 |g v. 344 |h pp. 143-150 |k n. 1-2 |p J. Mol. Struct. |x 00222860 |w (AR-BaUEN)CENRE-222 |t Journal of Molecular Structure | |
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| 856 | 4 | 0 | |u https://doi.org/10.1016/0022-2860(94)08415-E |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_00222860_v344_n1-2_p143_Biekofsky |y Handle |
| 856 | 4 | 0 | |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00222860_v344_n1-2_p143_Biekofsky |y Registro en la Biblioteca Digital |
| 961 | |a paper_00222860_v344_n1-2_p143_Biekofsky |b paper |c PE | ||
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