FIELD: chemistry.
SUBSTANCE: invention relates to organic chemistry and specifically to a method of producing benzimidazole derivatives of formula 
where X is a single bond, 
involving reaction of nitriles, selected from: 3-phenoxybenzonitrile, 3-phenoxyphenyl acetonitrile, 3-(3-phenoxyphenyl)acrylonitrile, 3-(3-phenoxyphenyl)-2-butenonitrile, 3-(3- phenoxyphenyl)propionitrile, 3-(3-phenoxybenzylamino)propionitrile, 2-methyl-2-(3-phenoxybenzoate)propionitrile, 3-phenoxyphenyl methoxypropionitrile with ortho-phenylene diamine hydrochloride in a sealed glass bulb. The process is carried out with molar ratio of nitrile to ortho-phenylene diamine hydrochloride of 1:1.2 at temperature 190-200°C.
EFFECT: novel method of producing said compound with good output and high degree of purity.
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