Fe₃O₄@SiO₂/Bipyridinium Nanocomposite as a Magnetic and Recyclable Heterogeneous Catalyst for the Synthesis of Highly Substituted Imidazoles Via Multi-Component Condensation Strategy

A magnetically separable catalyst consisting bipyridinium supported on silica coated Fe3O4 nanoparticles was prepared. Fe3O4@SiO2/bipyridinium nanocomposite (Fe3O4@SiO2/BiPy+22Cl–) was used as a recyclable heterogeneous catalyst for the synthesis of various multi-substituted imidazoles via multi-components cyclocondensation reaction of 1,2-dicarbonyl compounds, aldehydes and N-source compounds under solvent-free conditions. This catalyst...