Chem 231- Ch. 6 Aromatic Compounds

Chem 231- Ch. 6 Aromatic Compounds - AromaticCompounds

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Aromatic Compounds 6.1 The Structure of Benzene A. Kekule's Model of Benzene (1872) B. The Valence Bond Model of Benzene (1930) 1) Bond angels = 120 degrees 2) Hybridization of atomic orbitals a) Six sp2 hydridized C atoms b) Six 2p orbitals with 1 electron in each 3) Three sigma bonds per carbon 4) Six 2p electrons form a pi cloud KNown as the aromatic sextet. C. The Resonance Model of Benzene 1) Two equivalent contributing structures 2) Each C-C bond has some double bond character 5.2 Nomenclature A. Monosubstituted Benzenes 1) Name as derivatives of benzene (ethylbenzene) 2) IUPAC retains common names a) toluene b) cumene A. Monosubstituted Benzenes 1) Name as derivatives of benzene (ethylbenzene) 3) Complex molecules containing multiple functional groups are named with benzene as a substituent.
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a) phenyl group- one H removed from benzene b) benzyl group- one H removed from toulene. B. Disubstituted Benzenes 1) Three possible constitutional isomers a) 1,2- = ortho (o)
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This note was uploaded on 04/08/2009 for the course CHM 231 taught by Professor Barrows during the Spring '08 term at Grand Valley State University.

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Chem 231- Ch. 6 Aromatic Compounds - AromaticCompounds

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