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

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 m o le c u la r 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?
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 The Kekule Structure for Benzene In 1865 August Kekule proposed a structure for benzene consistent with the new Theory of Valence. The tetravalency of carbon was satisfied by
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern