Polyphosphoric acid supported on silica-coated NiFe2O4 nanoparticles: An efficient and magnetically-recoverable catalyst for Synthesis of 2,4,5-trisubstituted imidazoles

Polyphosphoric acid supported on silica-coated NiFe2O4 magnetic nanoparticles (NiFe2O4@SiO2–PPA)was found to be a rapid, green, simple and effective method for the synthesis of 2,4,5-trisubstituted imidazoles undersolvent-free conditions. NiFe2O4@SiO2–PPA was proved to be a recyclable and highly efficient catalyst which couldbe easily handled, recovered, and reused several times without significant loss of reactivity.

Keywords:

2 , 4 , 5-trisubstituted imidazoles , Silica-coated NiFe2O4 , PPA , Magnetic recovery , Nanoparticles