aromatic - A Structural Puzzle In 1834 the German chemist...

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5/1/2010 1 A Structural Puzzle In 1834 the German chemist Eilhardt Mitscherlich produced benzene from benzoic acid: C 6 H 5 COOH + CaO C 6 H 6 + CaCO 3 Benzoic acid Benzene His work showed the molecular formula of benzene is C 6 H 6 . Aliphatic and Aromatic Hydrocarbons By the mid-19th century, the Theory of Valence (Kekule, Couper, Butlerov) showed that most known organic compounds had about twice as many hydrogen atoms as carbon atoms. A pattern of atomic linkages was rapidly emerging, except for the "aromatic" compounds. Two broad classes of organic compounds were defined: aliphatic ("fatlike") and aromatic . The two types differed in their hydrogen/carbon ratios and their chemical reactivities. The aromatic compounds retained a six-carbon unit during chemical changes, and benzene (C 6 H 6 ) was the parent compound to the other aromatics. But what structure for benzene was consistent with the Theory of Valence?
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2 The Kekule Structure for Benzene In 1865 August Kekule proposed a structure for benzene consistent with
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This note was uploaded on 12/10/2010 for the course CHE 179582 taught by Professor Rzayev during the Spring '09 term at SUNY Buffalo.

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aromatic - A Structural Puzzle In 1834 the German chemist...

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