Bis-quinophthalone pigment and a process for preparing the same

摘要

The present disclosure relates to a bis-quinophthalone pigment of Formula I, and a process for the same.;
wherein X1, X2, X3 and X4 are independently H or halogen, preferably Cl or Br; R2 is substituent selected from the group consisting of H, C1-C20 straight or branched chain alkyl substituents, aromatic substituents, aliphatic substituents, and combinations thereof.

主权项

1. A process for preparing a bis-quinophthalone pigment of Formula (I), said process comprising the following steps; wherein X1, X2, X3 and X4 are independently H or halogen, preferably CI or Br; R2 is substituent selected from the group consisting of H, C1-C20 straight or branched chain alkyl substituents, aromatic substituents, aliphatic substituents, and combinations thereof, i. condensing a compound of Formula (II) wherein R2 is a substituent selected from the group consisting of H, C1-C20 straight or branched chain alkyl substituents, aromatic substituents, aliphatic substituents and combinations thereof, with substituted phthalic anhydride of Formula (III) wherein X1, X2, X3 and X4 are independently H or halogen, preferably Cl or Br, to obtain crude bis-quinophthalone compound of Formula (I); and ii. pigmenting crude bis-quinophthalone compound to obtain a bis-quinophthalone pigment of formula (I).