Relating to or containing a chemical group formed by connecting an azo compound (with a nitrogen-to-nitrogen double bond) to a benzene ring.
From azo- (from French azote, 'nitrogen') + phenyl (from Greek pheno-, 'showing' + -yl, 'radical'). This term emerged in 19th-century organic chemistry as chemists systematically named compounds containing azo linkages attached to benzene derivatives.
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