Aromatic compounds

  • Created by: Ash_angel
  • Created on: 17-02-19 10:03
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  • Aromatic compounds
    • Benzene
      • The Kekule model
        • C atom  with alternating single and double bonds between them
        • It should react in the same way as an alkene and should undergo electrophilic addition  reactions but Benzene doesn't...
      • The delocalised model
        • All 6 C atoms overlap to create a pi system.
        • pi system = above and below the plane of the  6 C atoms.
        • Why is this model better than Kekule model?
          • 1. Bond lengths in benzene are all the same
          • 2. The enthalpy change of hydrogenation's less than three times a double bond
          • 3. Benzene does not have sufficient electron density to polarise bromine in a electrophilic addition reaction
      • Reactions of Benzene
        • Electrophilic substitution
          • Nitration
          • Acylation (Friedal crafts)
          • Alkylation (Friedal crafts)
          • Halogenation using a halogen carrier
          • benzene ring is a region of high electron density so it attracts electrophile
        • Substituted Benzene Rings
          • Phenols
            • Weak acid and undergo acid + base reaction to from salt + water
            • electrophilic substitution
              • One lone pair gets donated into the delocalised ring which increases the electron density making it more likely to polarise  bromine.

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