25sec4

311 views

Published on

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
311
On SlideShare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

25sec4

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

×