Sheltering Mono-P-Ligated Metal Complexes in Porous Polystyrene Monolith: Effect of Aryl Pendant Stabilizers on Catalytic Durability

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  • Matsumoto, Hikaru
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University
  • Hoshino, Yu
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • Iwai, Tomohiro
    Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo
  • Sawamura, Masaya
    Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University
  • Miura, Yoshiko
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University

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  • Sheltering Mono‐P‐Ligated Metal Complexes in Porous Polystyrene Monolith: Effect of Aryl Pendant Stabilizers on Catalytic Durability

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Metal centers that can generate coordinatively unsaturated metals in accessible and stable states have been developed using synthetic polymers with sophisticated ligand and scaffold designs, which required synthetic efforts. Herein, we report a simple and direct strategy for producing polymer-supported phosphine-metal complexes, which stabilizes mono-P-ligated metals by modulating the electronic properties of the aryl pendant groups in the polymer platform. A three-fold vinylated PPh_3 was copolymerized with a styrene derivative and a cross-linker to produce a porous polystyrene-phosphine hybrid monolith. Based on the Hammett substituent constants, the electronic properties of styrene derivatives were modulated and incorporated into the polystyrene backbone to stabilize the mono-P-ligated Pd complex via Pd-arene interactions. Through NMR, TEM, and comparative catalytic studies, the polystyrene-phosphine hybrid, which induces selective mono-P-ligation and moderate Pd-arene interactions, demonstrated high catalytic durability for the cross-coupling of chloroarenes under continuous-flow conditions.

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