[CH3:1][C:2]1[S:3][C:4]2[CH:10]=[CH:9][CH:8]=[CH:7][C:5]=2[N:6]=1.[C:11]1([NH2:18])[CH:16]=[CH:15][CH:14]=[CH:13][C:12]=1[NH2:17].[S]>N1C=CC=CC=1.[Cl-].[Na+].O>[NH:17]1[C:12]2[CH:13]=[CH:14][CH:15]=[CH:16][C:11]=2[N:18]=[C:1]1[C:2]1[S:3][C:4]2[CH:10]=[CH:9][CH:8]=[CH:7][C:5]=2[N:6]=1The heterogeneous mixture consisting of methylbenzothiazole (59.6 g, 0.4 mol), ortho-phenylenediamine (43.2 g, 0.4 mol) and sulfur (38.4 g, 1.2 mol) in 300 ml of pyridine was heated at the reflux point of pyridine for 22 hours. The reaction mixture was cooled and poured into a solution of brine. After extraction with ethyl acetate, washing of the organic phase 3 times with water, drying over sodium sulfate and concentration of the solvent under vacuum, the solid obtained was washed with acetone. After drying, 2-(1H-benzimidazol-2-yl)benzothiazole (13.8 g, yield: 13%) was obtained in the form of a yellow solid.
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