Bronsted-acidic ionic liquid supported nanomagnetic: a novel and reusable catalyst for synthesis of oxygen-containing heterocyclic compounds

It is notable that Bronsted acidic ionic liquids (BAILs) have several substantial benefits to the organic and acid-catalysis reaction, which avoid the technical issues associated with mineral acids, such as hydrochloric, sulfuric, and nitric acids. Herein, an efficient and novel magnetic BAILs (Fe3O4@CTC@[BisPy][HC2O2]) comprised of hydrogen oxalate anion paired with triazine bis pyridinium cations was successfully constructed. This catalyst was characterized using diverse methods for instance: FTIR, XRD, MAP, SEM, VSM, TGA, DTG, TEM, and EDS. The catalytic performance of Fe3O4@CTC@[BisPy][HC2O2] was investigated in the synthesis of pyranopyrazole and 4H-benzo[b]pyran derivatives. The results showed that the synthesized Fe3O4@CTC@[BisPy][HC2O2] was efficient even at low concentrations and showed excellent ability as a magnetic catalyst. Remarkably, recycling tests showed that Fe3O4@CTC@[BisPy][HC2O2] nanoparticles remained highly active for the synthesis of heterocyclic compounds even after successive runs, which will contribute to speeding up the development of catalysts that reduce environmental pollution and advance chemical technology.

Automated summary

It is notable that Bronsted acidic ionic liquids (BAILs) have multiple advantages over mineral acids. A magnetic BAILs catalyst (Fe3O4@CTC@[BisPy][HC2O2]) was successfully developed and showed excellent catalytic performance in the synthesis of heterocyclic compounds. Moreover, it remained highly active even after multiple recycling.