Citation:
LU Huixia, LI peiying, ZHENG Jianchao, XU Xiujuan, LIU Pu. Preparation, Characterization and Catalytic Performance of Polyamidoamine-2-Pyridine Carbaldehyde Schiff Base Dendrimer Palladium Complexes[J]. Chinese Journal of Applied Chemistry,
;2016, 33(2): 161-168.
doi:
10.11944/j.issn.1000-0518.2016.02.150221
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Polyamidoamine(PAMAM)-2-pyridine carbaldehyde(Py) Schiff base dendrimers and their palladium complexes were prepared. Their structures were characterized by FT-IR, elemental analysis, ICP and TG-DSC. Catalytic performance of these complexes in Heck reaction was investigated. PAMAM-2-pyridine carbaldehyde Schiff base dendrimer palladium complexes show better catalytic activity in DMF. Using triethylamine(Et3N) as base, phenyliodide(PhI):10 mmol, n(PhI):n(AA):n(Et3N)=1:1.4:2.5(AA:acylic acid), n(Pd)=6.1×10-3 mmol(5.0G PAMAMPy-Pd). The yield is 90.1% with 100℃ and N2 for 24 min in 5 mL DMF under above optimal conditions. These catalysts can be recovered by the simple filtration and solvent washing. The yield of product can reach up to 82.0% when the catalyst is used for the third time.
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