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C1-symmetric Si-bridged (2-indenyl)(1-indenyl) ansa-metallocenes as efficient ethene/1-hexene copolymerization catalysts

Abstract

In the search for more efficient single-center ethene/α-olefin copolymerization catalysts, metallocenes bearing a 2-indenyl substituent pattern have largely been ignored in the past. Here, we show that such a structural motif yields competent linear low-density polyethylene (LLDPE) catalysts. They are also relatively easy to synthesize, allowing for a wide structural amplification. A screening of 28 catalysts reveals that the lead catalyst in this study displays high comonomer affinity and molecular weight capability at industrially relevant temperatures. QSAR models show that steric factors likely contribute stronger than electronic factors to the observed substituent trends, both for comonomer affinity and MW capability.

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Supplementary files

Article information


Submitted
26 Dec 2019
Accepted
12 Feb 2020
First published
14 Feb 2020

Dalton Trans., 2020, Accepted Manuscript
Article type
Paper

C1-symmetric Si-bridged (2-indenyl)(1-indenyl) ansa-metallocenes as efficient ethene/1-hexene copolymerization catalysts

D. Uborsky, D. Mladentsev, I. Borisov, B. Guzeev, A. Vittoria, C. Ehm, R. Cipullo, C. Hendriksen, N. H. Friederichs, V. Busico and A. Voskoboynikov, Dalton Trans., 2020, Accepted Manuscript , DOI: 10.1039/C9DT04896K

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