Preparation of pure 1,5-dinitroanthraquinone

Details Preparation of pure 1,5-dinitroanthraquinone Preparation of pure 1,5-dinitroanthraquinone

1976-04-01

1976-12-07

Shaver, Paul F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 7937, C09B 100

Patent

active

039962512

ABSTRACT:
A mixture of dinitroanthraquinones of which at least 35% is 1,5-dinitroanthraquinone is dissolved at elevated temperature in a halogenated aromatic hydrocarbon, a carboxylic acid nitrile or a cyclic sulphone and is thereafter cooled selectively to precipitate substantially pure 1,5-dinitroanthraquinone. Preferred solvents are 1-chloronaphthalene, sulpholane and adipic acid dinitrile. The temperature of dissolution ranges from about 120.degree. C up to the boiling point and cooling is by about 10.degree. to 200.degree. C to a temperature not below about 0.degree. C.

REFERENCES:
patent: 3786073 (1974-01-01), Frey et al.

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