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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ethylene/propylene copolymerization catalyzed by vanadium complexes containing N-heterocyclic carbenes
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Ethylene/propylene copolymerization catalyzed by vanadium complexes containing N-heterocyclic carbenes

机译：含N-杂环卡宾的钒配合物催化乙烯/丙烯共聚

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摘要

Various vanadium complexes containing N-heterocyclic carbenes, VOCl3[1,3-R-2(NCHv)(2)C:] (V1, R = 2,6-Me2C6H3; V2, R = 2,6-Et2C6H3; V3, R = 2,6-(Pr2C6H3)-Pr-i; V4, R = 2,4,6-Me3C6H2), have been synthesized and employed as catalyst precursors for ethylene/propylene copolymerization after activation by Et3Al2Cl3. Complex V4 showed higher catalytic activity of ca. 38 kg copolymer per (mol of V) per h and an ethylene/propylene copolymer with random monomer distribution could be prepared. Complex V3 consumed more cocatalyst than its analogues to reach higher catalytic activity. The obtained copolymers exhibit relatively narrow polydispersity and contain more randomly distributed monomer units than that the copolymers prepared by using the traditional vanadium catalytic system.
机译：各种含N杂环卡宾，VOCl3 [1,3-R-2（NCHv）（2）C：]的钒配合物（V1，R = 2,6-Me2C6H3; V2，R = 2,6-Et2C6H3; V3， R ＝ 2，6-（Pr 2 C 6 H 3）-Pr-1; V 4，R ＝ 2，4，6-Me 3 C 6 H 2）已被合成，并被Et 3 Al 2 Cl 3活化后用作乙烯/丙烯共聚的催化剂前体。络合物V4显示出较高的催化活性。可以制备每小时38千克共聚物（每摩尔V）和具有无规单体分布的乙烯/丙烯共聚物。复合物V3比其类似物消耗更多的助催化剂，以达到更高的催化活性。与使用传统的钒催化体系制备的共聚物相比，所获得的共聚物表现出相对窄的多分散性并且包含更多的无规分布的单体单元。

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