| abstract |
1,4-dia by reacting 1,4-diamino-2,3-dihaloanthraquitone (II) with boric acid and further reacting the resulting reaction product (IIa) with aqueous sulfite solution in an inert organic solvent It relates to a method for preparing minoanthraquinone-2,3-disulfonic acid (I), wherein the inert organic solvent used herein is a nonpolar solvent having a boiling point of 130 ° C. or higher and a density of 0.95 g / cm 3 or less.n n n The present invention also relates to 1,4-diaminoanthraquinone-2,3-dinitrile (III) by reacting the 1,4-diaminoanthraquinone-2,3-disulfonic acid (I) with cyanide. It relates to a manufacturing method of. |