1-Bromo-3-chloropropane → 1-(3-chloropropyl)-2-phenyl-1H-benzimidazole

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A mixture of 38.8 parts of 2-phenyl-1H-benzimidazole, 44 parts of a sodium methoxide solution 30% and 320 parts of 2-propanol is stirred and heated for 15 minutes at 50° C. After cooling, there are added 47.25 parts of 1-bromo-3-chloropropane. The whole is stirred and refluxed for 3 hours. The reaction mixture is evaporated. The residue is diluted with water and the product is extracted with methylbenzene. The extract is dried, filtered and evaporated, yielding 1-(3-chloropropyl)-2-phenyl-1H-benzimidazole as a residue.

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