| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for purifying 1,7'-dimethyl-2'-propyl-2,5'-bi-1H-benzimidazole prepared by a synthesis method and an improved method thereof, which can be used in an industrial scale. SOLUTION: The method for purifying 1,7'-dimethyl-2'-propyl-2,5'-bi-1H-benzimidazole prepared by reacting 2-propyl-4-methyl-1H-benzimidazole-6-carboxylic acid or its salt with N-methyl-o-phenylene-diamine or its salt, comprises treating a reacted mixture with a charcoal after the reaction, hydrolysis and pH adjustment. COPYRIGHT: (C)2011,JPO&INPIT
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