4.6 Article

One-pot Synthesis of Pd/Azo-polymer as an Efficient Catalyst for 4-Nitrophenol Reduction and Suzuki-Miyaura Coupling Reaction

Journal

CHEMISTRY-AN ASIAN JOURNAL
Volume 16, Issue 7, Pages 837-844

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.202100002

Keywords

4-Nitrophenol reduction; One-pot; Pd-azo-POPs; Suzuki-Miyaura Coupling

Funding

  1. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
  2. project of Scientific and Technologic Infrastructure of Suzhou [SZS201708]
  3. Research Fund Program of Key Laboratory of Rare Mineral, MNR [KLRM-KF202004]

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A one-pot method was used to prepare palladium complexed with azo porous organic polymer nanospheres, which exhibited high catalytic activity and cycling stability in both 4-nitrophenol reduction and Suzuki-Miyaura coupling reactions. The unique structure of the material promoted the formation of a uniform active center and improved electron transfer, resulting in efficient catalysis and high yields in the reactions.
The porous polymer matrix with good stability and confined microenvironment is considered as ideal support to stabilize isolated metal centers for catalysis. Herein, we report a one-pot method to prepare a kind of palladium complexed with azo porous organic polymer nanospheres (Pd-azo-POPs). The method combines the synthesis of azo-POPs with the reduction of the Pd ion, where azo serves as an anchoring group to limit the growth of Pd. The unique structure is conductive to the formation of a uniform active center and provides improved electron transfer. Pd-azo-POPs-80 exhibits a high catalytic activity and cycling stability both in 4-nitrophenol reduction and Suzuki-Miyaura coupling. The k(nor) for the 4-nitrophenol reduction was 174.7 min(-1) mM(-1) and the conversion remains above 90% after 6 cycles. Meanwhile, the yield was still up to 94.5% after 5 cycles for the Suzuki-Miyaura coupling reaction of benzene derivatives with I/Br under mild conditions.

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