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Synthesis, Characterization and Ethylene Oligomerization Studies of Chromium Complexes Bearing Imino-Furfural Ligands

Abstract : A series of chromium(III) complexes bearing imino-furfural ligands (Cr1-Cr4) were synthesized and characterized by high-resolution mass spectrometry (HRMS). All chromium precatalysts, activated with methylaluminoxane (MAO), exhibited moderate to high activities for ethylene oligomerization [turnover frequency (TOF) = 11,008-23,200 mol(ethylene) mol(Cr)-1 h-1)] producing oligomers in the range C4-C12+ with good selectivity for α-olefins. The in situ chromium precatalysts formed by mixing imino-furfural ligand L1 with [CrCl3(THF)3] or [Cr(acac)3] showed low activities, producing oligomers together with varying amounts of polyethylene. The use of different chromium sources and cocatalysts influences the activity as well as the selectivities toward α-olefin production, which suggests that different active species are formed.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01123599
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Submitted on : Thursday, March 5, 2015 - 11:01:35 AM
Last modification on : Friday, July 10, 2020 - 4:20:21 PM

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Ana H. D. P. S. Ulbrich, Jorge L. S. Milani, Paolo R. Livotto, Jean-François Carpentier, Osvaldo L. Casagrande Jr. Synthesis, Characterization and Ethylene Oligomerization Studies of Chromium Complexes Bearing Imino-Furfural Ligands. Journal of the Brazilian Chemical Society, Sociedade Brasileira de Química, SBQ, 2014, 25 (12), pp.2466-2474. ⟨10.5935/0103-5053.20140275⟩. ⟨hal-01123599⟩

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