5,12-Dihydro-3,10-dimethylquino[2,3-b]acridine-7,14-dione

It is a derivative of quinacridone with a methyl substituent on the parent body. The production process can refer to the production process of quinacridone red (CI Pigment Violet 19), and the aniline raw material in the process can be replaced with p-toluidine. In addition to the synthesis process of dibutyl succinate, there are four synthetic methods for reference. The dibromoterephthalic acid method uses p-xylene as raw material, brominated, oxidized and reacted with amine to prepare it. Hydroquinone method This process uses aniline as a raw material, undergoes carbonylation reaction with hydroquinone or p-benzoquinone, and then is synthesized by fusion with aniline, and is closed-loop preparation. However, the main disadvantage of the process is that the price of hydroquinone is relatively high. The fusion reaction of 2.5-diamino-terephthalic acid with excess cyclohexanone in the presence of sulfuric acid is used to prepare octahydroquinacridone by a ring reaction, and then the quinacridone is synthesized through pyrolysis and dehydrogenation. The diketene method is similar to the diethyl succinate method. Diketene is chloroethylated to prepare α-hydroacetyl ethyl, and then dimerized into hydroquinone-2, 5-dicarboxylic acid ethyl ester and further combined with aromatic amine Condensation, closed ring oxidation preparation.

Can be used for coloring of ink, paint, high-grade plastic resin, paint printing, soft plastic products, etc.