Direct observation of insertion events at rac-(C2H4(1-indenyl)2)Zr(MeB(C6F5)3)-polymeryl intermediates: distinction between continuous and intermittent propagation modes |
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Authors: | Landis Clark R Rosaaen Kimberly A Sillars Douglass R |
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Institution: | Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, USA. |
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Abstract: | 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 degrees 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. |
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