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机构地区:[1]北京化工研究院,北京100013 [2]中国科学院兰州化学物理研究所,兰州730000
出 处:《物理化学学报》1999年第3期284-288,共5页Acta Physico-Chimica Sinica
摘 要:With high presure in situ 1H NMR technique,the alternative copolymerization of CO with ethylene catalyzed by Pd(Ⅱ) DPPPr CF 3COOH 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.With high presure in situ 1H NMR technique,the alternative copolymerization of CO with ethylene catalyzed by Pd(Ⅱ) DPPPr CF 3COOH 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.
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