Carboxymethyl chitosan Schiff base supported heterogeneous palladium(II) catalysts for Suzuki cross-coupling reaction

• Synthesis and characterization O-carboxymethyl chitosan Schiff bases Pd(II) complexes.
• Characterization of the biarlys were by using GC–MS and 1H NMR.
• Thermal studies indicate that catalysts are suitable for C–C coupling reactions.
• OCMCS-3aPd and OCMCS-4aPd showed good activity in Suzuki coupling reactions.
• Catalysts were highly efficient even after ten runs.

In this study, two new O-carboxymethyl chitosan Schiff bases supported Pd(II) catalyst were synthesized (OCMCS-3aPd and OCMCS-4aPd). The catalysts were characterized with FTIR, TG/DTG, SEM/EDAX, XRD, ICP-OES, UV–vis, magnetic moment and molar conductivity. The catalytic activities of these catalysts were tested in the synthesis of biaryl compounds by Suzuki cross-coupling reactions. Characterizations of the biaryls were performed with GC–MS and 1H NMR. In synthesis of the biaryl compounds in the presence of the Pd(II) catalyst, high selectivity was observed; no homo-coupling byproducts were detected in the spectra. A reusability test demonstrated that the catalysts were highly efficient even after ten run. The mercury poisoning and leaching tests indicated that the catalysts have heterogeneous nature.

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