Phenylene group
Chemical group (–C6H4–); benzene with two substituents
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/40/P-phenylene-group-2D-skeletal.png/220px-P-phenylene-group-2D-skeletal.png)
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.[1] The phenylene group has three structural isomers, based on which hydrogens are substituted: para-phenylene, meta-phenylene, and ortho-phenylene.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/87/Ortho-meta-para.svg/150px-Ortho-meta-para.svg.png)
References
- ^ p. C-9, Section 11.6, Handbook of Chemistry and Physics, 62nd Edition, 1981-1982, CRC Press
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