S-Benzylisothiourea complex of palladium on magnetic nanoparticles: A highly efficient and reusable nanocatalyst for synthesis of polyhydroquinolines and Suzuki reaction

S-Benzylisothiourea complex of palladium supported on modified Fe3O4 magnetic nanoparticles (Pd-SBTU@Fe3O4) is reported for carbon-carbon coupling through the Suzuki coupling reaction. Also, the synthesis of polyhydroquinoline derivatives is reported in the presence of Pd-SBTU@Fe3O4 as nanocatalyst. The prepared nanoparticles were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, vibrating sample magnetometry and inductively coupled plasma atomic emission spectroscopy. The nanocatalyst was easily recovered using an external magnet and reused several times without significant loss of its catalytic efficiency. The heterogeneity of Pd-SBTU@Fe3O4 was studied using hot filtration.