Preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid and

Details Preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid and Preparation of 1,4-diaminoanthraquinone-2,3-disulfonic acid and

1993-07-08

1995-01-31

Richter, Johann

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

Organic compounds

Polycyclo ring system containing anthracene configured ring...

552225, C07C30300

Patent

active

053860420

ABSTRACT:
1,4-Diaminoanthraquinone-2,3-disulfonic acid (I) is prepared by reacting 1,4-diamino-2,3-dihaloanthraquinone (II) with boric acid in an inert organic solvent and further reacting the resulting reaction product (IIa) with an aqueous sulfite solution, by a method in which the inert organic solvent used is a nonpolar solvent having a boiling point of .gtoreq.130.degree. C. and a density of .ltoreq.0.95 g/cm.sup.3, and 1,4-diaminoanthraquinone-2,3-dinitrile (III) is prepared by reacting the 1,4-diaminoanthraquinone-2,3-disulfonic (I) with a cyanide.

REFERENCES:
patent: 4042605 (1977-08-01), Hartwig
patent: 4279825 (1981-07-01), Schmitz
patent: 4749521 (1988-06-01), Hattori et al.
Patent Abstracts of Japan, vol. 6, No. 266 (C-142) (1144), Dec. 25, 1982, JP-A-57 158 261, Sep. 30, 1982.
Chemical Abstracts, vol. 100, No. 16, Apr. 1984, An 122764f, "1,4-Diaminoanthraquinone-2,3-Disulfonic Acid".

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