Phenylene group

In organic chemistry, the phenylene group (−C6H4−) is based on a di-substituted benzene ring (arylene). For example, poly(p-phenylene) is a polymer built up from para-phenylene repeating units. The phenylene group has three structural isomers, based on which hydrogens are substituted: para-phenylene, meta-phenylene, and ortho-phenylene.

Not to be confused with phenalene.
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