2,5-Di-p-toluidinoterephthalic acid → 5,12-Dihydro-2,9-dimethylquino(2,3-b)acridine-7,14-dione

Participants

Reaction Steps

Pigmentary 2,9-dimethylquinacridone was prepared exactly as described in comparison Example 1 except that 10% by weight, relative to the 2,5-di(4-methylanilino)terephthalic acid, of 2,5-bis[4-(3-methoxypropylsulfamoyl)anilino]-1,4-cyclohexadiene-1,4-dicarboxylic acid, dimethyl ester (6.8 g) was included in the ring-closure reaction. 2,9-Dimethylquinacridone (60.3 g) was obtained as a magenta pigment.

Provenance & Evidence