An Eco-Friendly and Efficient Approach for the Synthesis of Tetrazoles via Fe3O4/HT-GLYMO-TA as a New Recoverable Heterogeneous Nanostructured Catalyst

摘要

Tannic acid immobilized on functionalized magnetic hydrotalcite(Fe3O4/HT-GLYMO-TA)was synthesized as a durable,environmentally-friendly and magnetic nanostructured catalyst for the synthesis of 5-and 1-substituted-1H-tetrazoles.The nanocatalyst was characterized by several methods,Fourier transform infrared(FT-IR),X-ray diffraction(XRD)analysis,transmission electron microscopy(TEM),field emission scanning electron microscopy(FE-SEM),energy-dispersive X-ray spectroscopy(EDS),EDS-map,thermogravimetric analysis(TGA),vibrating sample magnetometry(VSM)and CHNS analysis.The results displayed that the superparamagnetic catalyst with a mean particle size of approximately 23–27 nm has a plate-like shape.The catalytic activity of this new nanostructured catalyst resulted in the preparation of tetrazoles with high yields.Additionally,this novel procedure offers a plethora of benefits including short reaction times,the simplicity of operation,the ease of purification procedure and the reusability of nanocatalyst for at least eight cycles.