[NH2:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[NH2:10])[C:5]#[N:6].[CH2:11](OC=C(C#N)C#N)C>C(O)(C)C>[N:10]1[C:9]2[CH:8]=[CH:7][C:4]([C:5]#[N:6])=[CH:3][C:2]=2[NH:1][CH:11]=1A mixture of 3,4-diaminobenzonitrile (2) (1.0 g) and (ethoxymethylene)malononitrile (1.4 g) was refluxed in 50 mL of isopropyl alcohol for 16 h. The mixture was concentrated in vacuo to provide the title compound, 3H-benzo[d]imidazole-5-carbonitrile (3).
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