1,4-Dichlorobutane → 1-(4-chlorobutyl)-2-methyl-1H-benzimidazole

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To a stirred mixture of 13.2 parts of 2-methyl-1H-benzimidazole, 3 parts of N,N,N-triethylbenzenemethanaminium chloride and 225 parts of a sodium hydroxide solution 60% are added 25 parts of 1,4-dichlorobutane. The whole is heated to about 100° C. and stirring is continued for one hour at this temperature. The reaction mixture is cooled and poured onto ice-water. The product is extracted with methylbenzene. The extract is dried, filtered and evaporated. The residue is purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (90:10) as eluent. The pure fractions are collected and eluent is evaporated, yielding 1-(4-chlorobutyl)-2-methyl-1H-benzimidazole as a residue.

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