Preparation of a novel, efficient, and recyclable magnetic catalyst, γ-Fe2O3@HAp-Ag nanoparticles, and a solvent- and halogen-free protocol for the synthesis of coumarin derivatives

A catalyst of Ag supported on hydroxyapatite (HAp)-core-shell magnetic γ-Fe2O3 nanoparticles was prepared and characterized by FT-IR, XRD, TEM, SEM, and VSM analysis for use with the Pechmann condensation reaction. The nanomagnetic catalyst could be readily separated from solution via application of an external magnet allowing for straightforward recovery and reuse.164