Supported organometallic palladium catalyst into mesoporous channels of magnetic MCM-41 nanoparticles for phosphine-free C-C coupling reactions

Magnetic MCM-41 nanoparticles were synthesized via Fe3O4-doped into mesoporous channels of MCM-41 nanoparticles and further, a new organometallic complex of palladium was supported on its inner surface (Pd-imi@MCM-41/Fe3O4). This catalyst was applied as highly efficient and magnetically recoverable nanocatalyst in the variousC-C coupling reactions under phosphine-free conditions at atmospheric pressure. This catalyst has advantages of both magnetic nanoparticles and mesoporous materials. Thestructure of this catalyst has been characterized N2 adsorption–desorption isotherms, TEM, SEM, EDS, WDX, FT-IR, XRD, TGA, ICP, AAS, and VSM techniques. SEM images of this catalyst demonstrate that the particles size are less than 100 nm. VSM curve of the catalyst shows that this catalyst can be recovered using an external magnet; therefore, this catalyst can be reused for several times without significant loss of its catalytic efficiency. Also, all products were obtained in high TON and TOF numbers, which reveals this catalyst has high activity and selectivity in described coupling reactions. Heterogeneity and stability of this nanocatalyst were confirmed by hot filtration test and AAS technique. the selectivity of this catalytic system was confirmed by coupling of 1-bromo-4-chlorobenzene and aryl halides bearing –OH and –NH2 functional groups with phenylboronic acid.