The dicopper (II) complex [Cu2 (L)] 4+(L= α, α'-bis {bis [2-(1'-methyl-2'-benzimidazolyl) ethyl] amino}-m-xylene) reacts with hydrogen peroxide to give the dicopper (II)-hydroquinone complex in which the xylyl ring of the ligand has undergone a double hydroxylation reaction at ring positions 2 and 5. The dihydroxylated ligand 2, 6-bis ({bis [2-(3-methyl-1 H- benzimidazol-2-yl) ethyl] amino} methyl) benzene-1, 4-diol was isolated by decomposition ...