Direct preparation of pyrrolo¬3,4-c|pyrroles

Details Direct preparation of pyrrolo¬3,4-c|pyrroles Direct preparation of pyrrolo¬3,4-c|pyrroles

C - Chemistry, Metallurgy

09

B

C09B 57/00 (2006.01) C08J 3/22 (2006.01) C08K 5/3415 (2006.01) C09B 67/22 (2006.01)

Patent

CA 2273392

A process is disclosed for the direct preparation of pigmentary 1,4-diketopyrrolo-(3,4-c]pyrroles of the formula (I) (see formula I) wherein each of R1 and R2 independently of the other is an isocyclic or heterocyclic aromatic radical, which process comprises heating an appropriate molar ratio of a disuccinate with a nitrite of the formula (II) R1-CN (II) or of the formula (III) R2-CN (III) or with mixtures of said nitrites, in an organic solvent and in the presence of a strong base and an effective amount of a selected particle growth inhibitor of formula (IV)-(X), and then obtaining the compound of formula (I) from the reaction product by protolysis. The process yields pigmentary 1,4-diketopyrrolo-[3,4-c]pyrroles directly, i.e., without the need for additional particle-size reducing aftertreatments. Also disclosed is a composition comprising a pigmentary 1,4-diketopyrrolo-(3,4-c]pyrrole and the particle growth inhibitor. These pigment compositions are useful for pigmenting high molecular weight organic materials.

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