3-[[4-Amino-9,10-dihydro-9,10-dioxo-3-(sodiosulfo)anthracen-1-yl]amino]benzoic acid ethyl ester

Preparation

(a) 1-Amino-4-bromo-9,10-dioxo-9,10-dihydroanthracene-2-sulfonic acid and 3-Aminobenzoic acid?condensation, and ethanol and sulfuric acid ethyl change, and finally into sodium salt; (b)1-Amino-4-bromo-9,10-dioxo-9,10-dihydroanthracene-2-sulfonic acid and Ethyl 3-aminobenzoate in sodium bicarbonate and the presence of cuprous chloride condensation.

Properties and Applications

blue. Soluble in ethanol and soluble fiber element, insoluble in benzene, carbon tetrachloride, pottery, especially solvent. The strong sulfuric acid for green light blue, diluted into a red light blue solution, and the precipitation.