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Synthesis of Ti(IV) complexes of donor-functionalised phenoxy-imine tridentates and their evaluation in ethylene oligomerisation and polymerisation
journal contribution
posted on 2023-05-17, 21:30 authored by Suttil, JA, Shaw, MF, McGuinness, DS, Michael GardinerMichael Gardiner, Evans, SJA number of analogues of the Mitsui Chemicals ethylene trimerisation system (IV) have been explored, in which one of the donor atoms have been modified. Thus, a series of mono-anionic tridentate phenoxyimine (3-(t-butyl)-2-(OH)-C6H4C=N(C(CH3)2CH2OMe) 1, 3-(adamantyl)-2-(OH)-C6H4C=N(2’-(2’’-(SMe)- C6H4)-C6H4) 2, 3-(t-butyl)-2-(OSiMe3)-C6H4C=N(C(CH3)2CH2OMe) 3) or phenoxy-amine (3,5-di(t-butyl)-2-(OH)-C6H4CH2-N(2’-(2’’-(OMe)C6H4)-C6H4) 4) ligands have been prepared and reacted with TiCl4 or TiCl4(thf)2 to give the mono-ligand complexes 5–7. The solid state structures of compounds 4–6 have been determined. Complexes 5–7 have been tested for their potential as ethylene oligomerisation/polymerisation systems in conjunction with MAO activator and benchmarked against the Mitsui phenoxyimine trimerisation system IV. While the phenoxy-amine complex 6 shows a propensity for polymer formation, the phenoxy-imine complexes 5 and 7 show somewhat increased formation of short chain LAOs. Complex 5 is selective for 1-butene in the oligomeric fraction, while 7 displays liquid phase selectivity to 1-hexene. As such 7, which is a sulfur substituted analogue of the Mitsui system IV, displays similar characteristics to the parent catalyst. However, its utility is limited by the lower activity and predominant formation of polyethylene.
Funding
Sasol Technology Pty Ltd
History
Publication title
Dalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistryVolume
42Issue
25Pagination
9129-9138ISSN
1477-9226Department/School
School of Natural SciencesPublisher
RSC PublicationsPlace of publication
United KingdomRights statement
Copyright 2013 Dalton TransactionsRepository Status
- Restricted