Dienes are hydrocarbons which contain two double bonds. Dienes are intermediate between alkenes and polyenes. In chemistry, a hydrocarbon is any chemical compound that consists only of the elements carbon (C) and hydrogen (H). ... Covalently bonded hydrogen and carbon in a molecule of methane. ... An alkene in organic chemistry is an unsaturated hydrocarbon containing at least one carbon to carbon double bond. ... Polyenes are poly-unsaturated organic compounds that contain one or more sequences of alternating double and single carbon-carbon bonds. ...

Classes

Dienes can 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
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. A chemically conjugated system, is a system of atoms covalently bonded with alternating single and double bonds (e. ... Propyl allene is the simplest allene. ... Organic chemistry is the scientific study of the structure, properties, composition, reactions, and synthesis of organic compounds that by definition contain carbon. ... In ecology functional groups are collections of organisms based on morphological, physiological, behavioral, biochemical, or environmental responses or on trophic criteria. ...

Common dienes

The simplest conjugated diene is 1,3-butadiene. Cyclopentadiene is another example of a diene. Butadiene can refer to either one of two hydrocarbon chemical compounds which are alkenes that are isomers of each other. ... Cyclopentadiene, with molecular formula C5H6, is a clear, colorless, liquid organic chemical, with an odor reminiscent of turpentine or camphor. ...

from rozeta This image is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship. ...

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. A molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... An alkene in organic chemistry is an unsaturated hydrocarbon containing at least one carbon to carbon double bond. ... In ecology functional groups are collections of organisms based on morphological, physiological, behavioral, biochemical, or environmental responses or on trophic criteria. ... The Diels-Alder reaction is an organic chemical reaction (specifically, a cycloaddition) between a conjugated diene and a substituted alkene, commonly termed the dienophile to form a substituted cyclohexene system. ...