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AROMATIC COMPOUNDS

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  1. AROMATIC COMPOUNDS

  2. Meeting “Aroma”

  3. - Definition of aromatic molecule: a molecule containing one or more benzene rings.

  4. Identifying aromatic compounds

  5. Aromatic compounds in our daily life

  6. Aromatic ring (benzene ring) • benzene is perfectly hexagonal—all six carbon-carbon bonds have the same length, intermediate between that of a single and that of a double bond.

  7. Why aromatic compound is “aromatic”? • Many molecules containing benzene rings are quite fragrant and pleasant smelling.

  8. Resonance structure • The ring-like structure of benzene can be written in either of two Resonance Structure. • Definition of resonance structure: consists of alternating single and double bonds between carbon atoms. • The actual arrangement of electrons in the carbon is a mixture of both resonance structures. • Benzene is frequently represented as follows:

  9. Why Benzene’s resonance structures are unusually stable? • when resonance is involved, the real structure is more stable than we would expect from any of the structures we write using the one line

  10. How to draw resonance structures for Aromatic compounds?

  11. Practice time Page 232 / # 29 (b)

  12. How to name the Aromatic Structures? • General formula: ____benzene - attached F, Cl, Br, and I aroms are called “fluoro”, “chloro”, “bromo”, “iodo”. These are called halo group - if more than one of the same kind of halogen is present, use the prefixes di, tri, etc - if a compound contains both alkyl and halo groups, list the attached groups in alphabetical order. EXAMPLES~~

  13. Practice Time • Page 232 / # 31 (a) (e)

  14. Draw the structure of the following compounds

  15. Practice Time • Page 232 / # 30 (a) (c) (e)

  16. Today’s homework • Page 232 / # 30 b d f # 31 b d f

  17. Thank You!!! • If you have any questions, please ask us through the wikispaces! We will respond as soon as possible!

  18. Reference • Hebden Chemistry 11 Second printing, October 1998. Written by James A. Hebden, Ph.D • http://en.wikipedia.org/wiki/Aromatic_compounds May 25, 2010