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Issue 21, 2018
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Group 4 permethylindenyl constrained geometry complexes for ethylene polymerisation catalysis

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Abstract

We report the synthesis and characterisation of six permethylindenyl constrained geometry complexes of the type Me2SB(RN,I*)TiCl2 ({(η5-C9Me6)Me2Si(RN)}TiCl2; R = i-Pr, t-Bu, n-Bu, Ph, 4-t-BuPh and 4-n-BuPh). Three complexes (R = i-Pr, t-Bu and 4-t-BuPh) have been structurally characterised using single crystal X-ray diffraction. Reaction with solid polymethylaluminoxane (sMAO) yields solid catalysts active for the slurry phase polymerisation of ethylene. The activities increase with increasing electron donating character of the amido fragment. Me2SB(t-BuN,I*)TiCl2 exhibits an activity of 3602 kgPE molTi−1 h−1 bar−1 (30 minutes, 2 bar ethylene), an activity significantly greater than the previously synthesised Me2SB(t-BuN,Cp*)TiCl2.

Graphical abstract: Group 4 permethylindenyl constrained geometry complexes for ethylene polymerisation catalysis

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Publication details

The article was received on 03 Jul 2018, accepted on 23 Aug 2018 and first published on 28 Aug 2018


Article type: Paper
DOI: 10.1039/C8CY01374H
Citation: Catal. Sci. Technol., 2018,8, 5454-5461

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    Group 4 permethylindenyl constrained geometry complexes for ethylene polymerisation catalysis

    T. J. Williams, J. Buffet, Z. R. Turner and D. O'Hare, Catal. Sci. Technol., 2018, 8, 5454
    DOI: 10.1039/C8CY01374H

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