Direct Observation of Insertion Events at rac-(C2H4(1-indenyl)2)Zr(MeB(C6F5)3)-Polymeryl Intermediates: Distinction betw
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- 作者：Clark R. Landis ; Kimberly A. Rosaaen ; and Douglass R. Sillars
- 刊名：Journal of the American Chemical Society
- 出版年：2003
- 出版时间：February 19, 2003
- 年：2003
- 卷：125
- 期：7
- 页码：1710 - 1711
- 全文大小：60K
- 年卷期：v.125,no.7(February 19, 2003)
- ISSN：1520-5126
文摘
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 at T < -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 using 13C-labeled 1-alkenes supports a continuous insertion mechanism whereby the anion re-coordinates after each alkene insertion.
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 using 13C-labeled 1-alkenes supports a continuous insertion mechanism whereby the anion re-coordinates after each alkene insertion.