Immobilization of palladium(II)-containing bis(imidazolium) ligand on ion-exchange resins: efficient and reusable catalysts for CC coupling reactions

Suzuki reactions catalysed by a palladium(II) complex of a functionalized bis(imidazolium) ligand, Pd-II(BIM), immobilized on Dowex 50 WX8 and Amberlite IR-120 ion-exchange resins as heterogeneous, recyclable and active catalysts are reported. The catalysts, Pd-II(BIM)@Amberlite IR-120 and Pd-II(BIM)@Dowex 50 WX8, were characterized using Fourier transform infrared and diffuse-reflectance UV-visible spectroscopies and scanning electron microscopy. These heterogeneous catalysts are oxygen-insensitive and air- and moisture-stable in CC coupling reactions, and are reusable several times without significant loss of their catalytic activity. Copyright (c) 2015 John Wiley & Sons, Ltd.