olec10 - Aromaticity in Organic Molecules Roots of the...

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Unformatted text preview: Aromaticity in Organic Molecules Roots of the concept can be found in the many experimental observations that could not explained by the Kekulé-Couper theory of tetravalent carbon. Also, some compounds were found to have very high stability and unusual properties. Benzene itself was was discovered very early (1825) by Faraday who discovered it in the condensate of the pyrolysis product of whale oil. First chemical synthesis was by Mitscherlich in 1833: Mitscherlich, Eilhardt (1794 - 1863) German chemist . Mitscherlich, who was born at Neuende in Germany, studied oriental languages at Heidelberg and Berlin. He then turned to the study of medicine at Göttingen in 1817, where he became interested in crystallography. For two years he worked with Jöns Berzelius in Stockholm, returning to Berlin in 1821, where he was appointed to the chair of chemistry. While working on arsenates and phosphates, Mitscherlich realized that substances of a similar composition often have the same crystalline form (e.g., SO 3 and CrO 3 ) , and from this he formulated, in 1819, his law of isomorphism. This was in opposition to the orthodox view of the great mineralogist René Haüy that each substance has a distinctive crystalline form. Despite Haüy's rejection of the law, Berzelius accepted it and took Mitscherlich under his wing, including getting him the chaired position in Berlin....
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olec10 - Aromaticity in Organic Molecules Roots of the...

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