1 2008 Lecture 19 20 Aromatic_Compounds I II

1 2008 Lecture 19 20 Aromatic_Compounds I II - Chem...

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Chem 2203/2207 • Tuesday November 18 – Aromatic compounds Part I • Thursday November 20 – Aromatic compounds Part II • Tuesday November 25 – Aromatic compounds Part III • Thursday November 27 - Review lecture on final exam • 1995 final exam with answers as well as the 2007 final exam without answers is posted on http://http- server.carleton.ca/~pbuist/ • Assignments on Dienes and Aromatics have been posted on http://http-server.carleton.ca/~pbuist/
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Aromatic Compounds Chapter 15-16
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Aromatic Compounds •Benzene –the prototypical aromatic compound •Introduction to the concept of Aromaticity •Chemistry of Benzene •Reactions of MonoSubstituted Aromatics. •Synthesis of Drugs, Dyes and Antioxidants
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Aromatic Compounds • Historically, certain compounds were designated “aromatic’” on the basis of their unique “fragrance”. • These substances were found to contain a “cyclohexatriene” or “ benzene ” ring. BENZENE
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Why is benzene called benzene? •The bark of a tropical tree Styrax benzoin was extracted and yielded a resin containing benzoic acid Gum Benzoin Benzoic acid Benzene -CO 2
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More Nomenclature R phenyl R benzyl Benzene Phenyl” is derived from Grk “phaino” shining . This name was proposed because coal tar containing benzene was found to be a useful precursor for illuminating gas” used in coal gas lamps ..
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Benzene H H H H H C 6 H 6 • 3 double bonds + ring = 4 degrees of unsaturation • Recall a fully saturated C6 hydrocarbon has MF : C 6 H 14 (C n H 2n+2 ). Deg of unsat of benzene = [14-6] / 2 = 4 H
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Benzene • Benzene has a very stable carbon framework because…. . In addition to conjugation, benzene also has a special ring resonance (ring current) characteristic of all “aromatic” compounds
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Aromaticity compare with: + - • The special ring resonance stabilization
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This note was uploaded on 07/28/2009 for the course CHEMISTRY CHEM 2203 taught by Professor Levin during the Spring '08 term at Indian Institute of Technology, Chennai.

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1 2008 Lecture 19 20 Aromatic_Compounds I II - Chem...

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