METHOD OF OBTAINING 2-CYANO-3-ARYLACRYLIC ACIDS Russian patent published in 2014 - IPC C07C255/41 C07C253/30 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of organic chemistry, namely to a method of obtaining 2-cyano-3-arylacrylic acids of general formula given below, which can be applied as a regulator of plant growth, synthesis of medications, fungicides and pesticides. The method consists in boiling respective 2-arylidenemalononitriles in a medium of diluted nitric acid with a ratio nitric acid (65%): water as 5:3 (by volume) in the presence of catalytic amounts of potassium permanganate for 4-6 hours. The obtained sediment is washed with water, the target product is separated by re-crystallisation from water. In the said general formula Ar represents C₆H₅ (a), 2-ClC₆H₄ (b) and 3-ClC₆H₄ (c).

EFFECT: claimed method makes it possible to obtain 2-cyano-3-arylacrylic acids with good output, with the simultaneous reduction of harmful wastes and elimination of organic solvents from the process.

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