Topic_2.4_Aromatic_h - Aromatic Hydrocarbon Chapter 2.4 H H H H H H OR Kekule Structure However Kekule structure can’t explain why benzene

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Unformatted text preview: Aromatic Hydrocarbon Chapter 2.4 H H H H H H OR Kekule Structure However, Kekule structure can’t explain why benzene molecules are not undergoes addition reaction. Kekule structure Kekule suggested that the carbon atoms of benzene ring are in the ring, bonded to each other by alternating single and double bonds. Resonance Structure h In 1930s , Linus Pauling introduced the concept of hybrid orbital and resonance. h The real structure of benzene is the resonance hybrid from two Kekulé structure as shown below: Hybrid resonance structure NOMENCLATURE 1. naming monosubstituted benzene florobenzene chlorobenzene nitrobenzene F Cl NO 2 CH 3 CHO OH Toluene (methylbenzene) Benzaldehyde (phenylmethanal) Phenol (hydroxybenzene) Aniline (aminobenzene) Benzoic acid NH 2 COOH Many have special names for historical reasons: CH 3 CH 3 Cl Cl 1 2 3 4 5 6 1 2 3 4 5 6 1,2-dibromobenzene or o-dibromobenzene 1,3-dimethylbenzene or m-dimethylbenzene 1,4-dichlorobenzene or p-dichlorobenzene 2. When 2 substituents are present, their position is indicated by the prefixes ortho,meta or para or by the use of numbers....
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This note was uploaded on 05/08/2011 for the course ACCOUNTING 121210 taught by Professor Sdasdas during the Spring '10 term at Albany College of Pharmacy and Health Sciences.

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Topic_2.4_Aromatic_h - Aromatic Hydrocarbon Chapter 2.4 H H H H H H OR Kekule Structure However Kekule structure can’t explain why benzene

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