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 Pd⁰ and further grown on CMC to afford carboxymethylcellulose-supported palladium nanoparticles (CMC-Pd⁰). The as-generated CMC-Pd⁰ proved to be an efficient catalyst for these mentioned cross-coupling reactions under mild aerobic conditions. The CMC-Pd^II and CMC-Pd⁰ 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 Pd⁰ nanoparticles. Moreover, the catalyst showed no significant loss of efficiency after six catalytic cycles