n-propylsulfamic acid supported onto magnetic fe3o4 nanoparticles (mnps-psa) as a green and reusable heterogeneous nanocatalyst catalyst for the synthesis of 2-arylbenzimidazoles under solvent free conditions

A facile, rapid and solvent-free method for the conversion of o-phenylenediamine and arylaldehydes to the corresponding 2-aryl-benzimidazoles using n-propylsulfamic acid supported onto magnetic fe3o4 nanoparticles (mnps-psa) as a more robust and efficient catalyst under solvent free in good to excellent yields, is reported. the magnetic nanocatalyst can be readily recovered easily by applying an external magnet device and reused for at least 10 reaction runs without considerable loss of reactivity.