Preparation
(a) 1-Chloro-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid in the presence of copper with Naphthalen-2-amine?condensation, cyclization, (b) 1-(2-naphthyl amino)-anthraquinone-2-carbonyl chloride?in 1,2,4 – Trichlorobenzene in heating; (C) 1-Nitro-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid and Naphthalen-2-amine?and arsenic trichloride in 1, 2 – Dichlorobenzene in heating; (d) 2-Aminonaphthalene-1-sulfonic acid and 1-Chloro-9,10-dioxo-9,10-dihydroanthracene-2-carboxylic acid?condensation, heating (200 ~ 210 ℃) cyclization, and at the same time, remove sulfonic group.
