Solid Acid Supported on Magnetic Nanoparticles as a Highly Efficient and Retrievable Catalyst for the Synthesis 2-Substituted Benzothiazoles

Abstract

The use of a recyclable heterogeneous nanomagnetic solid acid catalyst, [Fe₃O₄@SiO₂@(CH₂)₃NPC–SO₃H]Cl, in a simple and highly efficient synthesis of benzothiazole derivatives by the reaction of aldehydes and o-aminothiophenol in water is reported. The MNP catalyst was characterized by FT-IR spectra, SEM, and TGA analysis, and vibrating sample magnetometery (VSM). The catalyst can be separated and recycled repeatedly by an external magnet without a significant loss in yield.