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Single site polymerization of ethylene and 1-olefins initiated by rare earth metal complexes

✍ Scribed by Eiji Ihara; Mitsufumi Nodono; Hajime Yasuda; Nobuko Kanehisa; Yasushi Kai

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
498 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Ethylene polymerization was explored by using the racemic SiMe~2~(2‐SiMe~3~‐4‐tBuC~5~H~2~)~2~Sm(THF)~2~ complex (1), meso type Me~2~Si(Me~2~SiOSiMe~2~)(3‐tBuC~5~H~2~)~2~Sm‐(THF)~2~ complex (2), and C~1~‐symmetric SiMe~2~[2,4‐(SiMe~3~)~2~C~5~H~2~][3,4‐(SiMe~3~)~2~C~5~H~2~]‐Sm(THF)~2~ complex (3) in the absence of methylaluminoxane. As a result, the meso isomer exhibits highest initiating activity, but the number‐average molecular weight is relatively low (M~n~ = 50000). In contrast to these complexes, the C~1~‐symmetric complex provides the highest molecular weight of polyethylene, M~n~ > 1000000, with relatively narrow molecular weight distribution (M~w~/M~n~ = 1.60). Only the racemic complex exhibits good activity for the polymerization of propylene, 1‐pentene and 1‐hexene.

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## Abstract Monocationic bis‐allyl complexes [Ln(η^3^‐C~3~H~5~)~2~(thf)~3~]^+^[B(C~6~X~5~)~4~]^−^ (Ln=Y, La, Nd; X=H, F) and dicationic mono‐allyl complexes of yttrium and the early lanthanides [Ln(η^3^‐C~3~H~5~)(thf)~6~]^2+^[BPh~4~]~2~^−^ (Ln=La, Nd) were prepared by protonolysis of the tris‐allyl