O-Phenylenediamine → HCID 135696401, compound

Reaction equation

[N+:1]([C:4]1[C:5]([OH:14])=[C:6]([O:12][CH3:13])[CH:7]=[C:8]([CH:11]=1)[CH:9]=O)([O-:3])=[O:2].[C:15]1([NH2:22])[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=1[NH2:21]>CO.[N+](C1C=CC=CC=1)([O-])=O>[N:21]1[C:16]2[CH:17]=[CH:18][CH:19]=[CH:20][C:15]=2[NH:22][C:9]=1[C:8]1[CH:11]=[C:4]([N+:1]([O-:3])=[O:2])[C:5]([OH:14])=[C:6]([O:12][CH3:13])[CH:7]=1

Participants

Procedure

aa) A solution of 4.93 g of 5-nitrovanillin and 2.7 g of 1,2-phenylenediamine in 45 ml of methanol and 15 ml of nitrobenzene is heated to boiling under reflux. After 15 minutes crystals begin to separate from the red solution. After 18 hours the reaction mixture is cooled to room temperature and diluted with 60 ml of methanol. The crystals are filtered under suction and washed with methanol. There is obtained 4-(2-benzimidazolyl)-2-methoxy-6-nitrophenol of m.p. 198°-200° (from N,N-dimethylformamide/methanol).