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.
Process for the production of dinitro-anthraquinones
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, (2008/06/13)
Dinitro-anthraquinones are produced by nitrating an anthraquinone in the presence of an indifferent organic solvent. As inert organic solvents there is suggested an aliphatic or alicyclic hydrocarbon having up to 12 carbon atoms and substituted once or several times by halogen or by the nitro group.