[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([N+:9]([O-:11])=[O:10])=[C:5]([O:12][CH3:13])[CH:4]=1.[Br:14]Br>C(Cl)(Cl)Cl>[Br:14][C:8]1[CH:7]=[C:6]([N+:9]([O-:11])=[O:10])[C:5]([O:12][CH3:13])=[CH:4][C:3]=1[O:2][CH3:1]1,3-Dimethoxy-4-nitrobenzene (5.0 g, 27 mmol) in chloroform (50 ml) at 0° C., was treated with a solution of bromine (1.68 ml, 33 mmol) in chloroform (50 ml). The solution was stirred with warming to room temperature for 4 hours, washed with 10% sodium thiosulfate solution and brine then dried over anhydrous magnesium sulfate and concentrated in vacuo. The crude product was used without further purification (D17). MS (ES+) m/e 262/264 [M+H]+.
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