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Title: Theoretical study of facial selectivity and regioselectivity in electrophilic addition reaction of chlorine to exo-tricyclo[,5]nona-3,7-diene
Authors: Abbasoglu, Rza
Yilrnaz, Sevil Savaskan
Keywords: Ab initio and DFT calculations;Facial selectivity and regioselectivity;Exo-tricyclo[,5]nona-3,7-diene;Molecular electrostatic potential;Pyramidalization
Issue Date: Jul-2006
Publisher: NISCAIR-CSIR, India
IPC Code: Int.Cl8 C07D
Abstract: For prediction and interpretation of facial selectivity and regioselectivity of the electrophilic addition reaction to exotricyclo[,5]nona-3,7-diene(exoTND) of chlorine, various models(geometric distortions, electron density, orbital effects, electrostatic effects and intermediates stabilities) have been used. Full geometric optimization of exoTND molecule has been done by ab initio and DFT methods and the structure of the molecule have also been investigated. Norbornene double bond(II) of molecule is endo pyramidalized and cyclobuten double bond(II) is also syn pyramidalized. The double bond(I) is more pyramidalized than the double bond(III) and it has higher reactivity. Exo face of the double bond(I) and anti face of the double bond(II) of the molecule are regions having much more electron density(qi,HOMO) and bigger negative potential. The exoTND-Cl2 system has been investigated by B3LYP/6-311+G* method and their stable configurations have been determined. The exoTND ... Cl2) and exoTND ... Cl2(anti) molecular complexes correspond to the most stable configurations of exoTND-Cl2 system. The most stable configuration of bridged cationic intermediates is the exo-bridged chloronium cation. The results that are obtained by using the models for predicted and interpredicted facial selectivity and regioselectivity of the electrophilic addition reaction of chlorine to exoTND molecule agree with each other. Facial selectivity and regioselectivity of the addition reaction parallel the pyramidalization of the double bond.
Page(s): 1722-1728
ISSN: 0042-6075
Appears in Collections:IJC-B Vol.45B(07) [July 2006]

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