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Issue 44, 2016
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Well-defined Ti4 pre-catalysts for the ring-opening polymerisation of lactide

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Abstract

The synthesis and full characterisation of four discrete tetrametallic titanium complexes is reported. These well-defined compounds are isostructural in the solid state and share the same general formula: Ti4(μ-O)2L4 (L = 1, 2, 3 or 4). Using a combination of NMR techniques the complexes are found to be stable in solution, even at elevated temperatures. Further studies show that the carboxylate moieties of the supporting amine bis(phenolate) ligands can be displaced by a more strongly coordinating solvent. This reversible process causes the coordinatively saturated Ti4(μ-O)2L4 complexes to separate into two Ti2(μ-O)L2 subunits which we envisaged would be catalytically active. Proof-of-concept experiments establish that all four of these complexes display catalytic activity in the ring-opening polymerisation of rac-lactide. These aggregates can therefore be viewed as air and moisture stable pre-catalysts for a range of reactions.

Graphical abstract: Well-defined Ti4 pre-catalysts for the ring-opening polymerisation of lactide

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The article was received on 04 Oct 2016, accepted on 17 Oct 2016 and first published on 17 Oct 2016


Article type: Paper
DOI: 10.1039/C6DT03842E
Citation: Dalton Trans., 2016,45, 17729-17738
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    Well-defined Ti4 pre-catalysts for the ring-opening polymerisation of lactide

    J. E. P. Cols, C. E. Taylor, K. J. Gagnon, S. J. Teat and R. D. McIntosh, Dalton Trans., 2016, 45, 17729
    DOI: 10.1039/C6DT03842E

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