Abstract
Two diphosphines 1,4-bis(diphenylphosphino)benzene (M1) and 4,4′-bis(diphenylphosphino)-1,1′-biphenyl (M2) were synthesized by employing Grignard reaction. They were subsequently employed to coordinate with palladium chloride to construct main-chain diphosphine-Pd organometallic polymers P1 and P2, respectively. Both polymers were used as self-supported heterogeneous catalysts for Suzuki-Miyaura coupling reactions of various aryl halides and arylboronic acids at room temperature. A higher catalytic activity for P1 and P2 than their homogeneous counterpart were observed, and the activity of P2 is slightly higher than that of P1. Moreover, polymer P2 can be readily recovered and reused for further transformations at least six times without decrease in catalytic activity, while an obvious decline of activity for P1 was observed after the fourth run.
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