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Transcript

  • 1. 25.4 Hydrocarbon rings
  • 2. Cyclic Hydrocarbons
    • The two ends of the carbon chain are attached in a ring in a cyclic hydrocarbon
      • sample drawings on page 759
      • named as “cyclo- ____”
    • hydrocarbon compounds that do NOT contain rings are known as aliphatic compounds
  • 3. Aromatic Hydrocarbons
    • A special group of unsaturated cyclic hydrocarbons is known as arenes
      • contain single rings, or groups of rings
      • also called “aromatic hydrocarbons”, because of pleasant odor
      • simplest aromatic is benzene (C 6 H 6 )
      • Term “aromatic” applies to materials with bonding like that of benzene
  • 4. Aromatic Hydrocarbons
    • Benzene is a six-carbon ring, with alternating double and single bonds
      • exhibits resonance, due to location of the double and single bonds-p.760
    • Benzene derivatives possible:
      • methylbenzene, 3-phenylhexane, ethylbenzene page 760
  • 5. Aromatic Hydrocarbons
    • Benzene derivatives can have two or more substitutents:
      • 1,2-dimethylbenzene
      • 1,3-dimethylbenzene
      • 1,4-dimethylbenzene
    • Can use ortho for 1,2; meta for 1,3; and para for 1,4 (page 761)
    C C C C

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