Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (2): 161-168.DOI: 10.11944/j.issn.1000-0518.2016.02.150221

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Preparation, Characterization and Catalytic Performance of Polyamidoamine-2-Pyridine Carbaldehyde Schiff Base Dendrimer Palladium Complexes

LU Huixiaa,LI peiyinga,ZHENG Jianchaoa,XU Xiujuanb*(),LIU Pua*()   

  1. aCollege of Chemistry and Molecular Engineering,Zhengzhou University,Zhengzhou 450001,China
    bZhengzhou Tobacco Research Institute of CNTC,Zhengzhou 450001,China
  • Received:2015-06-29 Accepted:2015-09-25 Published:2016-02-01 Online:2016-02-01
  • Contact: XU Xiujuan,LIU Pu
  • Supported by:
    Supported by by the National Natural Science Foundation of China(No.21404119)

Abstract:

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.

Key words: polyamidoamine dendrimer, pyridine carbaldehyde, Schiff base, palladium complex, Heck reaction