Palladium catalyst immobilized on functionalized hyper–cross-linked polymers with 8-hydroxyquinoline as monomer for Suzuki–Miyaura coupling reactions

Abstract

An e cient and stable palladium species catalyst immobilized on functionalised hyper-crosslinked polymers (HCPs-Pd) has been successfully developed and applied in the Suzuki-Miyaura coupling reaction of diverse types of aromatic halides with aromatic boric acid in this work. The results demonstrated that HCPs-Pd exhibited high catalytic activity, which bene ted from the microporous structure of the catalyst guaranteed high dispersibility of active palladium, and high speci c surface area, large pore volume, good chemical stability. Under optimal reaction conditions, 93.0% of biphenyl yield in the Suzuki-Miyaura reaction with bromobenzene (C 6 H 5 Br) and phenylboric acid (C 6 H 7 BO 2 ) as raw material was obtained. The good stability of the HCPs-Pd catalyst was veri ed by ve cycles experiments. Perhaps this work provides new insights into the high-yield preparation of biphenyl aromatic compounds employing HCPs-Pd as an e cient and stable catalyst in the Suzuki-Miyaura reaction.