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DieneDienes are hydrocarbons which contain two double bonds. Classes Dienes can divided into three classes: - Unconjugated dienes have the double bonds separated by two or more single bonds.
- Conjugated dienes have the double bonds separated by one single bond.
- Cumulated dienes have the double bonds sharing a common atom.
Common examples The simplest conjugated diene is 1,3-butadiene: The 1,3 configuration of double bonds found in 1,3-butadiene (conjugated double bonds) make these types of dienes capable of participating in more reaction types than is the case for molecules with either just a single alkene functional group or with multiple, but non-alternating, alkene groups. One possible reaction for such dienes is the Diels-Alder reaction. A compound in which two double bonds exist but are immediate adjacent to each other is, in contrast, called an allene. Cyclopentadiene is another example of a diene.
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