Magnetic nanoparticles supported a palladium bis(benzothiazole) complex: A novel efficient and recyclable catalyst for the synthesis of benzimidazoles and benzothiazoles from benzyl alcohol

Abstract

In this work, the synthesis and characterization of a new heterogeneous catalyst by palladium (II) 3,5-bis(2-benzothiazolyl)pyridine supported on magnetic nanoparticles, Pd(II)Cl2[email protected], was investigated. In this regard, iron nanomagnets were functionalized with 3-chloropropyl trimethoxy silane, silica coated, and then thiazole ligand was efficiently attached to their surface, and finally, palladium (II) was bonded to their surface. The catalyst, Pd(II)Cl2[email protected], was characterized by DR UV–vis and FT-IR spectroscopic techniques, elemental analysis, FE-SEM, ICP, XRD and TGA. The heterogeneous catalyst was used for the reaction between derivatives of benzyl alcohol with 1,2-phenylenediamine or 2-aminothiophenol and synthesis of benzothiazoles and benzimidazoles. This newly synthesized catalyst easily reused and recycled numerous times without noteworthy loss of its catalytic activity.