# Organic Chemistry/Dienes

\> Dienes

\<\< Alkynes \| Kinds of dienes
\>\>

In alkene chemistry, we
demonstrated that allylic carbon could maintain a cation charge because
the double bond could de-localize to support the charge. What of having
two double bonds separated by a single bond? What of having a compound
that alternates between double bond and single bond? In addition to
other concepts, this chapter will explore what a having a
conjugated system
means in terms of stability and reaction.

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

Dienes can divided into three classes:

-   Unconjugated dienes have the double bonds separated by two or more
    single bonds. These are also known as isolated dienes.
-   Conjugated dienes have conjugated double bonds separated by one
    single bond
-   Cumulated dienes (cumulenes) have the
    double bonds sharing a common atom as in a group of compounds called
    *allenes*.


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1.  Kinds of
    dienes
2.  Conjugation
3.  Diene properties and
    reactions

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\<\< Alkynes \| Dienes \|
Aromatics \>\>

