Microwave‐assisted synthesis of diketopyrrolopyrrole pigments in ionic liquid

In this study, the purpose has been to investigate a novel pathway for the synthesis of high performance diketopyrrolopyrrole pigments (DPPs) using diethyl succinate under microwave irradiation in the presence of ionic liquid (1‐butyl‐3‐methylimidazolium tetrafluoroborate, [BMIM][BF₄]), as a novel medium.

Rapid synthesis of DPPs was achieved in [BMIM][BF₄] as well as in dry medium under microwave irradiation based on succinate ester condensation with benzonitrile derivatives. The obtained results were compared with those of conventional method as well as Reformatsky route under microwave irradiation. The obtained pigments were characterized and their optical properties and the morphologies were investigated.

This study provides a novel approach to the synthesis of DPP pigments in a flash time with comparatively good yields.

DPPs have been synthesized via succinate ester route in ionic liquid media. Besides, they can also be synthesized based on Reformatsky method in ionic liquid media.

The developed method provides a simple and practical solution to improving the rapid synthesis of DPP pigments, with regard to their traditional application in many different industries, such as paints, inks, and plastics, as well as in electronic devices, LEDs, and laser dyes.

The method for synthesis of DPP pigments via succinate ester route in ionic liquid under microwave irradiation in a flash time was novel and could find applications in DPP pigments' industries.