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Vinyl‐polyethylene waxes with narrow dispersity using a thermally robust bis(imino)trihydroquinolyl‐chromium catalyst

Five structurally related chromium(III) complexes, [2‐(ArNCMe)‐8‐(NAr)C9H8N]CrCl3 (Ar = 2,6‐Me2Ph Cr1, 2,6‐Et2Ph Cr2, 2,6‐i‐Pr2Ph Cr3, 2,4,6‐Me3Ph Cr4, 2,6‐Et2‐4‐MePh Cr5), each bearing an unsymmetrical bis(imino)trihydroquinoline ligand, have been synthesized in good yield and fully characterized. The molecular structure of Cr2 reveals a distorted octahedral geometry at the metal center with the sterically bulky N,N,N‐ligand adopting a mer‐configuration. On activation with MAO or MMAO, Cr1 ‐ Cr5, were highly active catalysts for ethylene polymerization operating most effectively at 80 ◦C (up to 15.96 × 106 g (PE)*mol‐1 (Cr)*h‐1); even at 100 ◦C the activity still maintained a good level (2.92 × 106 g (PE)*mol‐1 (Cr)*h‐1). Highly linear polyethylene waxes of low molecular weight and narrow distribution (1.1 ‐ 1.8), incorporating predominantly vinyl/methyl and some methyl/methyl end‐groups, are a feature of the materials obtained. The influence of steric/electronic changes to the pre‐catalyst and polymerization reaction parameters on both the catalytic activities as well as the properties of the polymeric product has been the subject of a detailed investigation.

Authors:   Chuanbing Huang, Youfu Zhang, Gregory Solan, Yanping Ma, Xinquan Hu, Yang Sun, Wen-Hua Sun
Journal:   European Journal of Inorganic Chemistry
Year:   2017
Pages:   n/a
DOI:   10.1002/ejic.201700837
Publication date:   16-Aug-2017
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