[NH:1]([C:3]1[N:4]=[N:5][C:6]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)=[C:7]([CH3:9])[N:8]=1)[NH2:2].[CH:16](=O)[CH2:17][CH3:18]>Cl.CO>[CH3:9][C:7]1[N:8]=[C:3]([NH:1][N:2]=[CH:16][CH2:17][CH3:18])[N:4]=[N:5][C:6]=1[C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=1C.hydrochloric acid (1 drop) was added to a stirred solution of 3-hydrazino-5-methyl-6-phenyl-1,2,4-triazine (4.12 g) and propionaldehyde (4 ml) in methanol (15 ml) at room temperature, and the stirring was continued for 5 minutes. The reaction mixture was evaporated and the resultant residue was triturated with diethyl ether. The precipitates were collected by filtration to give 5-methyl-6-phenyl-3-(2-propylidenehydrazino)-1,2,4-triazine (3.89 g).
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