Issue 25, 2006

Titanium–salen complexes as initiators for the ring opening polymerisation of rac-lactide

Abstract

A family of bis(iso-propoxide) titanium(IV) complexes supported by tetradentate Schiff base (salen) ligands has been synthesised and characterised, including a structural determination of N,N′-bis(6′-methylenimino-2′,4′-di-tert-butylphenoxy)cyclohexyl-(1R,2R)-diamino titanium(IV) bis(iso-propoxide). Their suitability for initiating the ring-opening polymerisation of rac-lactide has been investigated. Polymerisation activities are shown to correlate with the electronic properties of the substituents within the salen ligand. In contrast to aluminium–salen initiators, electron-withdrawing substituents on the Schiff base ligand have a detrimental influence upon polymerisation activities, whereas the use of electron-donating alkoxy-functionalised ligands has allowed the highest recorded activity to date for a titanium-based initiator.

Graphical abstract: Titanium–salen complexes as initiators for the ring opening polymerisation of rac-lactide

Supplementary files

Article information

Article type
Paper
Submitted
03 Jan 2006
Accepted
03 Mar 2006
First published
27 Mar 2006

Dalton Trans., 2006, 3134-3140

Titanium–salen complexes as initiators for the ring opening polymerisation of rac-lactide

C. K. A. Gregson, I. J. Blackmore, V. C. Gibson, N. J. Long, E. L. Marshall and A. J. P. White, Dalton Trans., 2006, 3134 DOI: 10.1039/B518266B

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