129-39-5Relevant articles and documents
An efficient procedure for the preparation of 1-nitroanthraquinone
Sharghi,Tamaddon
, p. 2349 - 2359 (1991)
A novel and efficient method is developed for the selective mono nitration of anthraquinone (1). A mixture of fuming nitric acid, sulfuric acid and phosphoric acid in carbon tetrachloride is introduced as a new nitrating system for the high yield preparation of 1-nitroanthraquinone.
Separation of 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone
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, (2008/06/13)
A process for separating 1,5-dinitroanthraquinone and 1,8-dinitroanthraquinone by heating a dinitroanthraquinone mixture, in a mixture of from 5 to 85 per cent by weight of N-methylpyrrolidone and from 95 to 15 per cent by weight of an organic liquid which boils at from 80° to 210° C and is miscible in all proportions with N-methylpyrrolidone, at from 60° to 180° C, and separating off the undissolved material, at the extraction temperature, after the solution equilibrium has been reached. The insoluble material contains more than 85 per cent by weight, and as a rule more than 90 per cent by weight, of 1,5-dinitroanthraquinone. From the extract, it is possible to isolate the dissolved 1,8-dinitroanthraquinone together with the dissolved 1,5-dinitroanthraquinone and any byproducts which may be present.
Preparation of pure 1,5-dinitroanthraquinone
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, (2008/06/13)
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° C up to the boiling point and cooling is by about 10° to 200° C to a temperature not below about 0° C.