[Cl:1][C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[CH2:9][C:10]#[N:11].[N+:12]([O-])([OH:14])=[O:13]>ClCCl.OS(O)(=O)=O>[Cl:1][C:2]1[C:7]([N+:12]([O-:14])=[O:13])=[CH:6][CH:5]=[C:4]([Cl:8])[C:3]=1[CH2:9][C:10]#[N:11]To a solution of 2,6-dichloro-phenyl-acetonitrile (15.0 g, 80.62 mmol) in the dichloromethane (50 mL) and H2SO4 (40 mL) is added (slowly) a mixture of H2SO4 (14 mL) and HNO3 (5.5 mL) at 0° C. The reaction mixture is stirred at 0° C. for 20 minutes, warned to room temperature for half hour, and then concentrated to remove organic solvent. The solution is poured into a beaker containing ice-water (400 mL) to give a crystalline precipitate, which is collected by vacuum filtration and washed with water to afford the product (20.44 g, 82.4%).
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