[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:8]=[C:9]([O:11][CH3:12])[CH:10]=1)[CH:6]=O.[N+:13]([CH3:16])([O-:15])=[O:14].C([O-])(=O)C.[NH4+]>C(O)(=O)C>[N+:13]([CH:16]=[CH:6][C:5]1[CH:4]=[C:3]([O:2][CH3:1])[CH:10]=[C:9]([O:11][CH3:12])[CH:8]=1)([O-:15])=[O:14]A mixture consisting of 3,5-dimethoxybenzaldehyde (20 g), nitromethane (20 ml), ammonium acetate (8 g) and acetic acid (80 ml) was refluxted for 11/2 hours and the reaction mixture was poured into ice water. The yellow solid which separated was filtered and dried under high vacuum to yield the title compound (22.3 g).
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