Mohammad Faraji - Department of Chemistry, Babol Branch, Islamic Azad University, P. O. Box ۷۵۵, Babol, Iran

Magnetic Fe۳O۴ nanoparticle-supported molybdate sulfuric acid (MNPs-MSA) was synthesized and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The catalytic activity of MNPs-MSA was investigated as a recoverable catalyst for the one-pot synthesis of novel substituted coumarins in high to excellent yield at room temperature under solvent -free conditions. The magnetic nanocatalyst can be readily recovered easily by applying an external magnet device and reused for at least ۱۰ reaction runs without considerable loss of reactivity

Magnetic Fe۳O۴ nanoparticle-supported molybdate sulfuric acid (Fe۳O۴@MSA-NPs); novel substituted coumarins; Solvent free conditions; recoverable catalyst