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Citation: Luo He-Kuan, Li Da-Gang. Alternative Copolymerization of CO and Ethylene Catalyzed by Palladium(II)[J]. Acta Physico-Chimica Sinica, ;1999, 15(03): 284-288. doi: 10.3866/PKU.WHXB19990317 shu

Alternative Copolymerization of CO and Ethylene Catalyzed by Palladium(II)

Luo He-Kuan ,
Li Da-Gang

1.
Beijing Research Institute of Chemical Industry,Beijing 100013

Received Date: 11 May 1998
Available Online: 15 March 1999

With high presure in situ 1H NMR technique, the alternative copolymerization of CO with ethylene catalyzed by Pd(Ⅱ)-DPPPr-CF3COOH catalyst were studied under 2.0MPa CO/ethylene(1:1 ,molar ratio) using CD 3OD and CD 3COCD 3 as solvents. The 1H NMR signals of coordinated ethylene and methylene linked to Pd(Ⅱ) were observed, which showed that ethylene was activated by coordination with Pd(Ⅱ) during the copolymerization before it's insertion into Pd—C bond to achieve the chain propagation. But the signal of Pd—H bond was not observed in all the in situ 1H NMR experiments, which indicated that the copolymerization initiation was not caused by Pd—H bond, or Pd—H initiation was very few in alcoholic solvent.
- Carbon monoxide,
- Ethylene,
- Polyketone,
- Pd(II) catalyst,
- In situ NMR
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