Review of naming.

Review of Newmann projections

• Least stable conformation
  • this means eclipse position
  • Draw all 3 conformations, then determine which has the highest energy.
  • Those that have the highest steric interactions (bumping) have the highest energy. A steric interaction occurs when the molecule is so big it bumps into the neighboring atom/chain.
    • alkele-alkele interactions are the ones that have problem 'bumping', though hydrogen will interact to a very small amount.
  • tortional interactions are those between bonds (ie hydrogen repulsing hydrogen)

Covered alkene (C=C), alkane (C-C+), ketone (O=C:,,,), ester (O-C=O & C on C) & ether

Naming

• Alcohol; C4H8O
  • There is a double bond in there. You wind up with 6 possible combinations of locations for the double bond & the OH, without going into rings
  • If you include rings there are several more.
  • Cis & trans covered

• Drew an octane, figured out which had the first constituent; number form that end.
  • 2 methyls & 1 ethyl.
  • 5-ethyl-3,5-dimethyloctane