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aryl group

aryl group , in chemistry, group of atoms derived from benzene or from a benzene derivative by removing one hydrogen that is bonded to the benzene ring (see radical ). The simplest aryl group is phenyl, C ₆ H ₅  ; it is derived from benzene. The tolyl group, CH ₃ C ₆ H ₄ , is derived from toluene (methylbenzene). The xylyl group, (CH ₃ ) ₂ C ₆ H ₃ , is derived from xylene (dimethylbenzene). Just as several different alkyl groups may be derived from certain alkanes, so may several aryl groups be derived from certain aromatic compounds; for example, three different tolyl groups can be formed from toluene by removing hydrogen from different locations relative to the methyl group. When a functional group is joined with an aryl group, replacing the hydrogen that had been removed, a compound is formed whose characteristics depend largely on the functional group.

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