Phenylene

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]

Not to be confused with phenalene.
The chemical structure of the para-phenylene group.

References
  1. p. C-9, Section 11.6, Handbook of Chemistry and Physics, 62nd Edition, 1981-1982, CRC Press


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