Nano Fe_۳O_۴@SiO_۲@Cl: A Novel Magnetic Nanocatalyst for Efficient Benzopyran Synthesis

The development of efficient and recyclable catalytic systems for benzopyran synthesis remains a major challenge in sustainable chemistry. This study reports the design and characterization of a novel magnetic nanocatalyst (Fe۳O۴@SiO۲@Cl) prepared by functionalizing silica-coated magnetite nanoparticles with thionyl chloride. Comprehensive characterization using TG-DTA, FT-IR, XRD, and SEM confirmed the successful synthesis of the catalyst. The nanocatalyst showed exceptional performance in multicomponent benzopyran synthesis, achieving high yields (up to ۹۸%) in short reaction times (۱۵ min) under mild conditions. Notably, the system exhibited broad functional group tolerance, as verified by melting point analysis and NMR spectroscopy (¹H and ¹³C). Key advantages include outstanding selectivity, and easy magnetic separation for recycling. The synergistic combination of a superparamagnetic Fe۳O۴ core, silica interlayer, and active chlorine species enhances the catalyst's activity. This work offers an eco-friendly, high-performance catalytic solution for benzopyran synthesis with significant industrial potential.

کلیدواژه ها:

Magnetic nanoparticles ، Heterogeneous catalyst ، Benzopyran derivatives ، Nano Catalyst ، Environmentally benign ، Knoevenagel condensation