Direct observation of insertion events at rac-(C2H4(1-indenyl)2)Zr(MeB(C6F5)3)-polymeryl intermediates:: Distinction between continuous and intermittent propagation modes
Direct observation of insertion events at rac-(C2H4(1-indenyl)2)Zr(MeB(C6F5)3)-polymeryl intermediates:: Distinction between continuous and intermittent propagation modes
复制标题
DOI：
10.1021/ja028070o
复制
发表时间：
2003-02-19
影响因子：
15
通讯作者：
Sillars, DR
中科院分区：
文献类型：
--
作者：
Landis, CR;Rosaaen, KA;Sillars, DR
[rac-(C2H4(1-茚基)2)Zr(CH3)][CH3B(C6F5)3] 催化的 1-己烯、丙烯和乙烯聚合的增长物质已在 T< -40 °C 下截获并通过 NMR 方法进行表征。对繁殖物种的观察允许通过 NMR 直接监测起始、繁殖和终止过程。使用 13 C标记的1-烯烃对烯烃并入Zr-聚合物物质的详细检查支持连续插入机制，其中阴离子在每次烯烃插入后重新配位。
The propagating species for 1-hexene, propene, and ethene polymerization as catalyzed by [rac-(C2H4(1-indenyl)2)Zr(CH3)][CH3B(C6F5)3] has been intercepted atT< −40 °C and characterized by NMR methods. Observation of the propagating species permits direct monitoring of initiation, propagation, and termination processes by NMR. Detailed examination of alkene incorporation into Zr−polymeryl species using13C-labeled 1-alkenes supports a continuous insertion mechanism whereby the anion re-coordinates after each alkene insertion.