Diene

Dienes are hydrocarbons which contain two double bonds. Dienes are intermediate between alkenes and polyenes.

Classes
Dienes can be divided into three classes:
 * 1) Unconjugated dienes have the double bonds separated by two or more single bonds.
 * 2) Conjugated dienes have conjugated double bonds separated by one single bond. They are also the most stable.
 * 3) Cumulated dienes have the double bonds sharing a common atom as in a group of compounds called allenes.

In organic chemistry a conjugated diene is also a functional group. With a general formula of CnHn. a classic organic reaction for the synthesis of dienes is the Whiting reaction.

Reactions with dienes
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 for example Danishefsky’s diene.

دايين Polyene Dieno Diène Alkadiēni Диен Alkadieen Dieny Диены Диен Dien