FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for synthesis of N,N-bis-acetoacetylarylamides that are used as azo-components in manufacturing high-strength azo-pigments. N,N-bis-acetoacetylarylamides are prepared by reaction of diketene with primary carbocyclic aromatic amines in a solvent medium, Carbocyclic aromatic amines represent unsubstituted phenylenediamines or substituted phenylenediamines wherein 2,5-dimethyl-1,4-phenylenediamine, 2-methyl-5-chloro-1,4-phenylenediamine and 2,5-dichloro-1,4-phenylenediamine are used. Reaction is carried out at temperature 35-75°C in the presence of acetone taken in the amount 0.5-1 mole/1 mole of used diamine, in 99.5-100% acetic acid medium that is recovered to cycle after isolation of the reaction end product. Invention provides enhancing yield and quality of end products.
EFFECT: improved method of synthesis.
5 cl, 1 tbl, 11 ex
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