FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing 4-[2-chloro-1-formyl-2-R-vinyl]-5-nitrophthalonitriles of said general formula 
where R denotes C6H5, or 4-OCH3C6H4, or 4-CH3C6H4, or 2-thienyl, which can be used as precursors in synthesis of biologically active substances, phthalocyanines and hexazocyclanes. The disclosed method includes use of substituted 4-nitro-5-(2-oxoethyl)phthalonitriles and phosphorus oxychloride POCl3 as starting reagents. Reaction of said reagents takes place at 90-110°C and molar ratio 1:2-3, respectively, for 2.5-5 hours in dimethylformamide solution. The reaction mass is then cooled and poured into cold 5-20% sodium bicarbonate solution. The crystalline precipitate is filtered, recrystallised from an alcohol and dried on air.
EFFECT: high degree of purity of the compound.
1 tbl, 4 ex
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