Pyridine-type Supported Pd(II) Complex on Fe3O4@SiO2@SBA-15 for O-Arylation

In this study, a ligand, 4-(5-(pyridine-2-yl)-1,3,4-oxadiazol-2-yl)anilineopropyltriethoxysilane (POATES) has been prepared in three steps starting from pyridine-2-carbonitrile, according to Scheme 1 [1-2]. Magnetite nanoparticles, obtained via co-precipitation method and covered by silica and mesoporous silica (SBA-15) layers, were silylated with POATES (Fe3O4@SiO2@SBA-15-POATES) [3]. The core shells of the supported ligand were stirred in EtOH solution of Pd(II) to afford the supported Pd(II) complex, Scheme 2, which has been used as magnetically retrievable catalyst in O-arylation coupling reaction of aryl halides with phenol, Scheme 3 [4].