[CH3:1][O:2][C:3]1[CH:8]=[C:7]([O:9][CH3:10])[CH:6]=[CH:5][C:4]=1[N+:11]([O-:13])=[O:12].[I:14](Cl)(=O)=O.I(Cl)(=O)=O.C([N+](C)(C)C)C1C=CC=CC=1>C(O)(=O)C.[Cl-].[Zn+2].[Cl-]>[I:14][C:6]1[CH:5]=[C:4]([N+:11]([O-:13])=[O:12])[C:3]([O:2][CH3:1])=[CH:8][C:7]=1[O:9][CH3:10]To a solution of 2,4-dimethoxy-nitrobenzene (1.0 g) in glacial acetic acid (30 mL) is added benzyltrimethylammonium dichloroiodate (1.90 g) and anhydrous zinc chloride (1.0 g) and the mixture is stirred at room temperature under an atmosphere of argon. Additional benzyltrimethylammonium dichloroiodate (0.4 g) is added after 5 hours and again after 24 hours. Additional zinc chloride (0.5 g) and glacial acetic acid (15 mL) is added after 24 hours. The mixture is permitted to stir at room temperature for 3 days and is then filtered, diluted with 5% aqueous sodium bisulfite, and extracted three times with ethyl acetate. These pooled organic extracts are washed successively with 5% aqueous sodium bisulfite, saturated aqueous sodium chloride, then dried over anhydrous magnesium sulfate. After removal of the solvent under reduced pressure the residue is triturated with hexanes to provide the desired product as a pale yellow solid.
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