Carboxymethylcellulose-Supported Palladium Nanoparticles Generated in Situ from Palladium(II) Carboxymethylcellulose: An Efficient and Reusable Catalyst for Suzuki-Miyaura and Mizoroki-Heck Reactions

A very easy method is described here for direct preparation of palladium(II) carboxymethylcellulose (CMC-Pd-II) by ion exchange of sodium carboxymethylcellulose (CMC-Na) and PdCl2. When the resulting CMC-Pd-II was employed as a catalyst in Suzuki-Miyaura and Mizoroki-Heck cross-coupling reactions, Pd-II was reduced in situ to Pd-0 and further grown on CMC to afford carboxymethylcellulose-supported palladium nanoparticles (CMC-Pd-0). The as-generated CMC-Pd-0 proved to be an efficient catalyst for these mentioned cross-coupling reactions under mild aerobic conditions. The CMC-Pd-II and CMC-Pd-0 were fully characterized by FT-IR, ICP-AES, XPS, XRD, SEM, EDX, TEM, and TGA. The characterized results demonstrated that the true catalytic species are Pd-0 nanoparticles. Moreover, the catalyst showed no significant loss of efficiency after six catalytic cycles.