Preparation of pyrrolo¬3,4-c|pyrroles

Details Preparation of pyrrolo¬3,4-c|pyrroles Preparation of pyrrolo¬3,4-c|pyrroles

C - Chemistry, Metallurgy

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260/298.5, 260/2

C07D 487/04 (2006.01) C08K 5/3415 (2006.01) C09B 57/00 (2006.01)

Patent

CA 1236105

3- 13921/1+2/+ Preparation of pyrrolo[3,4-c]pyrroles Abstract A process for the preparation of 1,4-diketopyrrolo-[3,4-c]pyrroles of the formula Image (I), wherein each of Rl and R2 independently of the other is an isocyclic or heterocyclic aromatic radical, which process comprises reacting 1 mole of a disuccinate with 2 moles of a nitrile of the formula R1 - CN (II) or R2-CN (III) or with 1 mole of a nitrile of the formula (II) and 1 mole of the nitrile of the formula (III), in an organic solvent and in the pres- ence of a strong base at elevated temperature, and obtaining the com- pound of formula I from the reaction product by hydrolysis. The pyrrolo-[3,4-c]pyrroles are suitable for pigmenting organic material of high molecular weight.

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