Process for the preparation of a N,N'-dimethyl-perylene-3,4,9,10

Details Process for the preparation of a N,N'-dimethyl-perylene-3,4,9,10 Process for the preparation of a N,N'-dimethyl-perylene-3,4,9,10

1976-02-02

1979-05-08

Berch, Mark L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

106308Q, 106288Q, C07D47106, C09B 562

Patent

active

041536029

ABSTRACT:
N,N'-dimethyl-perylene-3,4,9,10-tetracarboxylic acid diimide is obtained as a valuable pigment of a pure red shade, by reacting perylene-3,4,9,10-tetracarboxylic acid anhydride at low temperatures with a dilute aqueous solution of at least the four-fold molar amount of methylamine. The so-obtained bis-ammonium salt of the bis-N-methyl amide is then heated without isolation to effect ring closure while splitting off two mols of water and two mols of methyl amine. The product can be used without any finish operation or can be after-treated to yield a pigment of an exceptionally high transparency or of a good hiding power.

REFERENCES:
patent: 2473015 (1949-06-01), Cullinan
patent: 2543747 (1951-03-01), Shrader
patent: 2905685 (1959-09-01), Eckert
patent: 3340264 (1957-09-01), Walker
patent: 3628976 (1971-12-01), Stocker
patent: 4018791 (1977-04-01), Spietschka et al.

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