Phenylene
Overview
 
The phenylene group is based on a di-substituted benzene
Benzene
Benzene is an organic chemical compound. It is composed of 6 carbon atoms in a ring, with 1 hydrogen atom attached to each carbon atom, with the molecular formula C6H6....

 ring (arylene
Arylene
An arylene or arenediyl is a substituent of an organic compound that is derived from an aromatic hydrocarbon that has had a hydrogen atom removed from two ring carbon atoms, such as phenylene....

). For example, poly(p-phenylene)
Poly(p-phenylene)
Poly is the precursor to a conducting polymer of the rigid-rod polymer host family. Oxidation or the use of dopants is used to convert the non-conductive form to a semiconductor. It is made of repeating p-phenylene units....

 is a polymer
Polymer
A polymer is a large molecule composed of repeating structural units. These subunits are typically connected by covalent chemical bonds...

built up from para-phenylene repeating units.
 
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