B Maleki - Department of Chemistry, Hakim Sabzevari University, Sabzevar, ۹۶۱۷۹-۷۶۴۸۷, Iran
G Esmailian Kaboo - Department of Chemistry, Hakim Sabzevari University, Sabzevar, ۹۶۱۷۹-۷۶۴۸۷, Iran

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.

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