[OH:1][C:2]1[CH:7]=[C:6]([S:8]([O-:11])(=[O:10])=[O:9])[C:5]([OH:12])=[CH:4][C:3]=1[S:13]([O-:16])(=[O:15])=[O:14].[K+:17].[K+].C(N(CC(O)=O)CCN(CC(O)=O)CC(O)=O)CN(CC(O)=O)CC(O)=O.S(=O)(=O)(O)O.OO>O>[C:5]1(=[O:12])[CH:4]=[C:3]([S:13]([O-:16])(=[O:15])=[O:14])[C:2](=[O:1])[CH:7]=[C:6]1[S:8]([O-:11])(=[O:9])=[O:10].[K+:17].[K+:17]
34.6 g (100 mmol) of dipotassium 2,5-dihydroxybenzene-1,4-disulfonate were dissolved in 500 ml of water at 60° C. After addition of 0.68 g (2 mmol) of iron 5,14-dihydrodibenzo[b,i][5,9,14,18]-tetraaza[14]annulene, 0.8 g (2 mmol) of diethylenetriaminepentaacetic acid, 1 ml of concentrated sulfuric acid and 1 ml of a commercial antifoam agent, 28.4 g (250 mmol) of 30% by weight aqueous hydrogen peroxide were added dropwise. The mixture was stirred for 15 min at 60° C. The solution was cooled to 5°-10° C. and then the solid was filtered off with suction and recrystallized from water to yield 14.5 g (42%) of dipotassium 1,4-benzoquinone-2,5-disulfonate in the form of reddish brown needles. Melting point >360° C.
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