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

Abstract

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 À 1 mM À 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.

Construction of stable bio-Pd catalysts for environmental pollutant remediation

“…38 The catalytic activity and stability of the Pd/yeast/rGO catalysts were also comparable or superior to other some reports. 3,32,36,39 For example, K app of this work at the rst time could reach 2.16 min À1 (3.6 Â 10 À2 s À1 ) which were higher than K app of Pd-azo-POPs-80 catalyst (0.344 min À1 ) in Yus' the work, 39 whereas K app of this work was not better than that of He's work (84 Â 10 À3 s À1 ). 36 More comparison with some current researches was listed in Table S2.…”

TBAX/Oxone‐Mediated Halogenation of Pyrazoles and Other Heterocycles: An Entry to Important Cross‐Coupling Reactions

“…To examine the practicality of this approach, we further subjected these halogenated heterocycles for showcasing the extension and utility of our method to the important cross coupling reactions for making C−C bonds under the conditions of known procedure. Compound 2 on reaction with different aryl/heteroaryl phenylboronic acid in presence of palladium catalyst afforded the desired product in good yields (Scheme 3a) [13] . By using known protocol, we placed another reaction of compound 2 with phenyl acetylene using copper iodide as catalyst leading to the formation of desired C−C coupled product in 84% yield (Scheme 3b) [14] .…”

“…Compound 2 on reaction with different aryl/heteroaryl phenylboronic acid in presence of palladium catalyst afforded the desired product in good yields (Scheme 3a). [13] By using known protocol, we placed another reaction of compound 2 with phenyl acetylene using copper iodide as catalyst leading to the formation of desired CÀ C coupled product in 84% yield (Scheme 3b). [14] This CÀ I bond of product 2 was successfully changed into another CÀ C bond in presence of palladium acetate and ethylacrylate (Scheme 3c).…”

Rational Design of Pt−Pd−Ni Trimetallic Nanocatalysts for Room‐Temperature Benzaldehyde and Styrene Hydrogenation

“…In the XRD patterns of Pt/Ni/C, there is a weak diffraction peak of PtNi(111) alloy (2θ=42.8°). For Pd/Ni/C, a weak diffraction peak of Pd(111) plane appears at 40.1° [34–36] . In the XRD patterns of Pt−Pd/Ni/C, the diffraction peak at 2θ=40° is assigned to PtPd(111) alloy phase.…”