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Issue 26, 2012
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Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization

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Abstract

Functionalized diaminophenols, H(NR1R2R1R2R1R2R1R2R1R2R1R2R1R2R1R2NR3R3R3R3R3R3R3R3O), were investigated as ligands for indium catalysts in the ring-opening polymerization of racemic lactide. Precursor complexes (NMe2NMeO)InCl2 (1), (NPr2NO)InCl2 (2), and (NMesNO)InCl2 (3) were synthesized and fully characterized by 1H and 13C NMR spectroscopy, elemental analysis, and single-crystal X-ray crystallography. Complexes 1 and 2 were used to synthesize alkoxy-bridged complexes [(NMe2NMeO)InCl]2(μ-Cl)(μ-OEt) (4) and [(NPr2NO)InCl]2(μ-Cl)(μ-OEt) (5). These complexes catalysed the polymerization of racemic lactide at different rates, with complex 5 being substantially more active than complex 4. The dissociation behaviour of these catalysts in the presence of lactide was also studied and used to make comparisons with previously reported catalyst systems.

Graphical abstract: Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization

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Supplementary files

Article information


Submitted
19 Jan 2012
Accepted
05 Mar 2012
First published
08 Mar 2012

Dalton Trans., 2012,41, 8123-8134
Article type
Paper

Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization

K. M. Osten, I. Yu, I. R. Duffy, P. O. Lagaditis, J. C.-C. Yu, C. J. Wallis and P. Mehrkhodavandi, Dalton Trans., 2012, 41, 8123
DOI: 10.1039/C2DT30148B

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