[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=O)=[CH:4][CH:3]=1.[N+:10]([CH2:13][CH3:14])([O-:12])=[O:11].C([O-])(=O)C.[NH4+].S(=O)(=O)(O)O>C1(C)C=CC=CC=1>[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[C:13]([N+:10]([O-:12])=[O:11])[CH3:14])=[CH:4][CH:3]=1A solution of 30.0 g (162 mmol) of 4-bromobenzaldehyde, 116 mL (1.6 mole) of nitroethane, and 37.5 g (486 mmol) of ammonium acetate in 200 mL of toluene was heated under a Dean and Stark trap for 18 hours. The mixture was then cooled to 80° C., 1 mL of concentrated sulfuric acid was added, and the mixture was stirred at 80° C. for 2 hours. The mixture was then cooled to ambient temperature and washed with 200 mL of brine. The organic layer was separated and the aqueous layer was extracted three times with 60 mL of diethyl ether. The combined organics were dried (MgSO4), filtered and coincentrated in vacuo. The residue was recrystallised from methanol to afford 18.7 g (47%) of the title compound.
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