Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (02): 158-163.doi: 10.3866/PKU.WHXB19970211

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High Pressure in situ IR Studies on Mechanism of Palladium(II) Catalyzed Copolymerization of CO with Ethylene

Luo He-Kuan,Li Da-Gang   

  1. Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000
  • Received:1996-05-27 Revised:1996-08-16 Published:1997-02-15
  • Contact: Luo He-Kuan

Abstract:

The copolymerization of CO with ethylene was studied with high pressure in situ IR technique using (DPPPr)Pd(p-CH3PhSO3)2 as the catalyst precursor. Two IR absorptions of carbonyl groups were observed at 1900cm-1 and 1810cm-1 under pure CO ambience, which proved that CO was coordinated with Pd(Ⅱ) under pure CO ambience. Three IR absorptions were observed at 1638, 1616, 1970cm -1 under real reaction conditions, which could be assigned to three intermediates (1,2,3) respectively, indicating that the insertion of CO into Pd-OR bond was probabaly one of the main initation path ways in alcohol solvent.

Key words: Carbon monoxide, Ethylene, Copolymerization, In situ IR