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Abstract:

The 19F NMR shieldings for several remotely substituted rigid polycyclic alkyl fluorides with common sets of substituents covering a wide range of electronic effects were calculated using the DFT-GIAO theoretical model. The level of theory, B3LYP/6-311+G(2d,p), was chosen based on trial calculations which gave good agreement with experimental values where known. The optimized geometries were used to obtain various molecular parameters (fluorine natural charges, electron occupancies on fluorine of lone pairs and of the C-F bond, and hybridization states) by means of natural bond orbital (NBO) analysis which could help in understanding electronic transmission mechanisms underlying 19F substituent chemical shifts (SCS) in these systems. Linear regression analysis was employed to explore the relationship between the calculated 19F SCS and polar substituent constants and also the NBO derived molecular parameters. The 19F SCS are best described by an electronegativity parameter. The most pertinent molecular parameters appear to be the occupation number of the NBO p-type fluorine lone pair and the occupation number of the C-F antibonding orbital. This trend suggests that in these types of rigid saturated systems hyperconjugative interactions play a key role in determining the 19F SCS. Electrostatic field effects appear to be relatively unimportant. Copyright © 2003 John Wiley & Sons, Ltd.

Registro:

Documento: Artículo
Título:Computation and analysis of 19F substituent chemical shifts of some bridgehead-substituted polycyclic alkyl fluorides
Autor:Adcock, W.; Peralta, J.E.; Contreras, R.H.
Filiación:Sch. of Chem. Phys.,/Earth Sciences, Flinders Univ. of South Australia, Adelaide, SA 5001, Australia
Departamento de Física, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, (1428) Buenos Aires, Argentina
Palabras clave:19F chemical shift; Bridgehead-substituted bicyclic fluorides; DFT-GIAO; DFT-NBO; Hyperconjugative interactions; NMR; Substituent effects; bridged compound; carbon; fluoride; fluorine; polycyclic hydrocarbon; article; chemical bond; electromagnetic field; electron; geometry; nuclear magnetic resonance spectroscopy; parameter; rigidity; substitution reaction; theoretical model
Año:2003
Volumen:41
Número:7
Página de inicio:503
Página de fin:508
DOI: http://dx.doi.org/10.1002/mrc.1202
Título revista:Magnetic Resonance in Chemistry
Título revista abreviado:Magn. Reson. Chem.
ISSN:07491581
CODEN:MRCHE
CAS:carbon, 7440-44-0; fluoride, 16984-48-8; fluorine, 7782-41-4
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07491581_v41_n7_p503_Adcock

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Citas:

---------- APA ----------
Adcock, W., Peralta, J.E. & Contreras, R.H. (2003) . Computation and analysis of 19F substituent chemical shifts of some bridgehead-substituted polycyclic alkyl fluorides. Magnetic Resonance in Chemistry, 41(7), 503-508.
http://dx.doi.org/10.1002/mrc.1202
---------- CHICAGO ----------
Adcock, W., Peralta, J.E., Contreras, R.H. "Computation and analysis of 19F substituent chemical shifts of some bridgehead-substituted polycyclic alkyl fluorides" . Magnetic Resonance in Chemistry 41, no. 7 (2003) : 503-508.
http://dx.doi.org/10.1002/mrc.1202
---------- MLA ----------
Adcock, W., Peralta, J.E., Contreras, R.H. "Computation and analysis of 19F substituent chemical shifts of some bridgehead-substituted polycyclic alkyl fluorides" . Magnetic Resonance in Chemistry, vol. 41, no. 7, 2003, pp. 503-508.
http://dx.doi.org/10.1002/mrc.1202
---------- VANCOUVER ----------
Adcock, W., Peralta, J.E., Contreras, R.H. Computation and analysis of 19F substituent chemical shifts of some bridgehead-substituted polycyclic alkyl fluorides. Magn. Reson. Chem. 2003;41(7):503-508.
http://dx.doi.org/10.1002/mrc.1202