Silica-Supported Pentamethylcyclopentadienyl Ytterbium(II) and Samarium(II) Sites: Ultrahigh Molecular Weight Polyethylene without Co-Catalyst.

Author(s) Allouche, F.; Chan, K.Wing; Fedorov, A.; Andersen, R.A.; Copéret, C.
Journal Angew Chem Int Ed Engl
Date Published 2018 Mar 19

Designing highly active supported ethylene polymerization catalysts that do not require a co-catalyst to generate electrophilic metal alkyl species is still a challenge despite its industrial relevance. Described herein is the synthesis and characterization of well-defined silica-supported cyclopentadienyl Ln sites (Ln=Yb and Sm) of general formula [(≡SiO)LnCp*]. These well-defined surface species are highly activite towards ethylene polymerization in the absence of added co-catalyst. Initiation is proposed to occur by single electron transfer.

DOI 10.1002/anie.201800542
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2018;57(13):34313434.

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