Salalen aluminium complexes and their exploitation for the ring opening polymerisation of rac-lactide

Reference:

Whitelaw, E. L., Loraine, G., Mahon, M. F. and Jones, M. D., 2011. Salalen aluminium complexes and their exploitation for the ring opening polymerisation of rac-lactide. Dalton Transactions, 40 (43), pp. 11469-11473.

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Official URL:

http://dx.doi.org/10.1039/c1dt11438g

Abstract

In this paper we report the first use of Al(iii) salalen complexes for the ring opening polymerisation of rac-lactide. Polylactides with narrow polydispersities (PDIs range from 1.04-1.65) and moderate degrees of stereoselectivity were formed. Eight salalen Al(iii) complexes have been prepared and fully characterised by solution-state NMR spectroscopy and, where appropriate, single crystal X-ray diffraction. With ligand 3H2 either a monomeric or dimeric Al(iii) species was formed, the dimeric species was favoured at low concentrations. The complexes were tested for the ring opening polymerisation of rac-lactide in toluene at 80 or 100 C. Interestingly, various tacticities of polymer were formed, which were dependent upon the nature of the group bound to the amine nitrogen centre.

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