Diene

This MedLibrary.org supplementary page on Diene is provided directly from the open source Wikipedia as a service to our readers. Please see the note below on authorship of this content, as well as the Wikipedia usage guidelines. To search for other content from our encyclopedia supplement, please use the form below:

Related Sponsors

BM Pharmacy Generic pharmaceuticals at unbeatable prices. Insomnia, men's health, hair health, pain control. bmpharmacy.com
Online Pharmacy Carisoprodol, tadalafil, sildenafil, vardenafil and more... xlpharmacy.com
MedBasket.com Discreet. Inexpensive. Fast shipping. Great selection. What more can we say? medbasket.com
Frugalmed 2000 reasons to shop with us first. frugalmed.com
Ads by Tiva

Dienes or diolefins 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.
  4. Heterodienes have one or more of the unsaturated carbon atoms replaced with a heteroatom.


Classes of Dienes
1,5-Cyclooctadiene, an unconjugated diene. Notice that each double bond is two carbons away from the other.
Isoprene, also known as 2-methyl-1,3-butadiene, is one of the simplest conjugated dienes.
Propan-1,2-diene, also known as allene, is the simplest cumulated diene.

In organic chemistry a conjugated diene is also a functional group. With a general formula of CnH2n-2. a classic organic reaction for the synthesis of dienes is the Whiting reaction.

1,3-butadiene undergoes 1,2-addition and 1,4-addition.

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.

External links

Wikipedia content modification information:

  • This page was last modified on 12 November 2008, at 02:30.

Wikipedia Authorship and Review

Wikipedia content provided here is not reviewed directly by MedLibrary.org. Wikipedia content is authored by an open community of volunteers and is not produced by or in any way affiliated with MedLibrary.org.

Wikipedia Usage Guidelines

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article on "Diene".

The URL for this specific entry is:

All Wikipedia text is available under the terms of the GNU Free Documentation License. (See Copyrights for details). Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.