Reactive Intermediates Formed During Olefin Polymerization by Methylalumoxane-Activated ansa-Zirconocene Catalysts: Identification of a Chain-Carrying Intermediate by NMR Methods | Zendy

Dmitrii E. Babushkin | Zendy; Hans H. Brintzinger | Zendy

Open Access

Reactive Intermediates Formed During Olefin Polymerization by Methylalumoxane-Activated ansa-Zirconocene Catalysts: Identification of a Chain-Carrying Intermediate by NMR Methods

Author(s) -

Dmitrii E. Babushkin,

Hans H. Brintzinger

Publication year - 2009

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/ja909157r

Subject(s) - chemistry , allylic rearrangement , olefin polymerization , catalysis , olefin fiber , hexene , polymer chemistry , polymerization , chain (unit) , long chain , stereochemistry , medicinal chemistry , organic chemistry , ethylene , polymer science , polymer , physics , astronomy

Addition of 1-hexene to methylalumoxane-activated catalyst systems based on rac-Me(2)Si(ind)(2)ZrMe(2) causes, concurrent with polyhexene formation and diminution of the otherwise prevalent cation [rac-Me(2)Si(ind)(2)Zr(mu-Me)(2)AlMe(2)](+), formation of a hitherto unobserved species [rac-Me(2)Si(ind)(2)Zr(mu-R)(mu-Me)AlMe(2)](+), where R is a Zr-bound polyhexyl chain. As hexene is increasingly consumed, this cation decays, mainly back to [rac-Me(2)Si(ind)(2)Zr(mu-Me)(2)AlMe(2)](+) and, in part, to some species containing a Zr-bound allylic chain end.

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