1,2-Dihydroxy-4-nitro-9,10-anthraquinone

Preparation

(a) 1,2-Dihydroxyanthraquinone dibenzoate?nitrifying after hydrolysis; (b) 1,2-Dihydroxyanthracene-9,10-dione in sulfuric acid of nitration: (C) 1,2-Dihydroxyanthracene-9,10-dione in Arsenic acid, the presence of hemihydrate?in sulfuric acid of nitration.

Properties and Applications

dark brown. Soluble in ethanol. In concentrated sulfuric acid for yellow red, dilution after yellow flocks.