Wednesday, April 18, 2012

Alkenes and Alkynes: Double and Triple Bonds

Carbon can form double and triple bonds with Carbon atoms. When multiple bonds form, fewer Hydrogens are attached to the carbon atom. Naming rules are almost the same as with alkanes.
  • The position of the double/triple bonds always has the lowest number and is put in front of the parent chain.
Double bonds (Alkenes) end in -ene. Triple bonds (Alkynes) end in -yne.

EX:
What is the name of this alkene?
What is the name of this alkyne?
Draw 3,3,4,4, tetramethyl 5,6 dimethyl 1 heptyne.
Trans and Cis Butene:
If two adjacent carbons are bonded by a double bond and have side chains on them two possible compounds are possible.
Multiple Double Bonds:
More than one double bond can exist in a molecule. Use the same multipliers inside the parent chain.

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