Cationic palladium(II) catalysts on O-carboxymethyl chitosan Schiff base for Suzuki coupling reactions

ABSTRACT

In this study, catalytic activity of two different cationic O-Carboxymethyl chitosan Schiff base palladium (II) complexes in Suzuki coupling reactions and synthesis of biarlys having different functional groups, and reusability of the catalysts were tested. Chemical structures of the synthesized biaryls were elucidated by GC-MS and ¹H-NMR; and no by-products were observed in the spectra. Cationic palladium (II) catalysts high turnover numbers and selectivity were recorded for the reactions. Mercury test demonstrated that the reaction mechanism proceed a homogeneous route. Reusability tests of cationic biocatalysts showed that their catalytic activity were still highly efficient even after six cycles.

KEYWORDS:

• Biopolymer
• O-carboxymethyl chitosan Schiff base
• Suzuki coupling reaction
• homogeneous catalyst

Funding

This work was financial support by the Scientific and Technical Research Council of Turkey (TUBITAK; Project Number: 113Z296), Aksaray University Scientific Research Projects Coordination (Project Number: 2012–20). Science and Technology Application and Research Center of Aksaray University, Turkey.