P(Cl)(Cl)(Cl)=O.[N+:6]([C:9]1[CH:10]=[C:11]([CH:15]=[CH:16][CH:17]=1)[N:12]([CH3:14])[CH3:13])([O-:8])=[O:7].CN(C)[CH:20]=[O:21]>>[N+:6]([C:9]1[CH:10]=[C:11]([N:12]([CH3:13])[CH3:14])[CH:15]=[CH:16][C:17]=1[CH:20]=[O:21])([O-:8])=[O:7]720 parts of phosphorus oxychloride is added at 25°C to a solution of 498 parts of m-nitrodimethylaniline in 1800 parts by volume of dimethylformamide. The mixture is then heated within 1 hour to 75° to 80°C and stirred at this temperature for six hours. After the solution has cooled it is poured into 6000 parts of ice-water. The precipitate is suction filtered, washed and recrystallized from acetone. 385 parts (66% of theory) of 2-nitro-4-dimethylaminobenzaldehyde having a melting point of 115° to 116°C is obtained. ##SPC14##
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