2,5-Dianilinoterephthalic acid → Quinacridone

Participants

Reaction Steps

Pigmentary quinacridone was prepared exactly as described in comparison Example 2 except that 10% by weight, relative to the 2,5-dianilinoterephthalic acid, of 2,5-di(sulfamoylanilino)terephthalic acid (6 g) was included in the ring-closure reaction. Quinacridone (50.2 g) was obtained as a violet pigment.

Provenance & Evidence