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Catalysts 2016, 6(3), 47; doi:10.3390/catal6030047

Homo-Polymerization of 1-Hexene Catalysed by O^N^N (Salicylaldimine)Iron(III) Pre-Catalysts to Branched Poly(1-hexene)

Department of Chemistry, University of Johannesburg, Auckland Park Kingsway Campus, Auckland Park, 2006, South Africa
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Author to whom correspondence should be addressed.
Academic Editor: Carl Redshaw
Received: 22 September 2015 / Revised: 1 March 2016 / Accepted: 2 March 2016 / Published: 17 March 2016
(This article belongs to the Special Issue Molecular Catalysis for Precise Olefin Polymerization and ROP 2015)
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Abstract

Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L2) or 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl2(L1)] (1), [FeBr2(L1)] (2), [FeI2(L1)] (3), [FeBr2(L2)] (4) and [FeCl2(L3)] (5). All the iron(III) complexes 1–5 were activated with EtAlCl2 to produce active catalysts for the polymerisation of 1-hexene to low molecular weight poly(1-hexene) (Mn = 1021–1084 Da) and very narrow polydispersity indices (1.19–1.24). 1H and 13C{1H} NMR analysis showed the polymers are branched with methyl, butyl and longer chain branches. The longer chain branches are dominant indicating that 2,1-insertion of monomer is favoured over 1,2-insertion in the polymerisation reaction. View Full-Text
Keywords: (salicylaldimine)iron(III) pre-catalysts; 1-hexene polymerisation; branched low molecular weight poly(1-hexene); narrow polydispersity indices (salicylaldimine)iron(III) pre-catalysts; 1-hexene polymerisation; branched low molecular weight poly(1-hexene); narrow polydispersity indices
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yankey, M.; Obuah, C.; Darkwa, J. Homo-Polymerization of 1-Hexene Catalysed by O^N^N (Salicylaldimine)Iron(III) Pre-Catalysts to Branched Poly(1-hexene). Catalysts 2016, 6, 47.

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