[Cl:1][C:2]1[C:15]2[C:14](=[O:16])[C:13]3[C:8](=[C:9]([OH:17])[CH:10]=[CH:11][CH:12]=3)[C:7](=[O:18])[C:6]=2[C:5]([Cl:19])=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2:26](Br)[C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1>CC(C)=O>[Cl:1][C:2]1[C:15]2[C:14](=[O:16])[C:13]3[C:8](=[C:9]([O:17][CH2:26][C:27]4[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=4)[CH:10]=[CH:11][CH:12]=3)[C:7](=[O:18])[C:6]=2[C:5]([Cl:19])=[CH:4][CH:3]=1A mechanically stirred mixture of 177.2 g (0.605 mol) of 1,4-dichloro-5-hydroxy-9,10-anthracenedione (1, British Pat. No. 1,029,448), 83.5 g (0.605 mol) of powdered anhydrous potassium carbonate, 79 ml (0.675 mol) of benzyl bromide, and 1.7 l of dry acetone was heated at reflux for three days. The initial dark brown suspension changed to an olive green color signaling the end of the reaction. The mixture was filtered hot and the salts were washed with hot acetone. The cooled filtrate was concentrated to ~1/2 of its volume. The yellow precipitate was collected by filtration, washed with acetone and methanol, and dried at 200 mm/50° C./12 hr to leave 201.2 g (87%) of 2, mp 122°-126° C.
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