The dienes are Hydrocarbure S which contain two double connections. There exist three types of dienes:
- the not combined dienes have their double linkings separated by two or more simple connections
- the combined dienes have their double linkings separated by only one simple connection
- the cumulated dienes, called Allène S have their double linkings carried by same carbon
The term dioléfine was the name given in the past to dienes; although still employed, this term falls more and more in disuse.
The combined diene simplest is the butt-1,3-diene:
Configuration 1,3 of the double connection found in butt-1,3-diene (double conjugées connections) returns these types of dienes capable of participation in more types of reaction than it is not the case for molecules with Juste a functional group simple alkene or with multiple, but not-alternation alkene of the groups. A possible reaction for dienes is the Réaction of Diels-Alder.
The Cyclopentadiène is another example of diene.
- Olefinic hydrocarbon
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