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Issue 9, 2015
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Overcoming aggregation in indium salen catalysts for isoselective lactide polymerization

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Abstract

A methodology for controlling aggregation in highly active and isoselective indium catalysts for the ring opening polymerization of racemic lactide is reported. A series of racemic and enantiopure dinuclear indium ethoxide complexes bearing salen ligands [(ONNOR)InOEt]2 (R = Br, Me, admantyl, cumyl, t-Bu) were synthesized and fully characterized. Mononuclear analogues (ONNOR)InOCH2Pyr (R = Br, t-Bu, SiPh3) were synthesized by controlling aggregation with the use of chelating 2-pyridinemethoxide functionality. The nuclearity of metal complexes was confirmed using PGSE NMR spectroscopy. Detailed kinetic studies show a clear initiation period for these dinuclear catalysts, which is lacking in their mononuclear analogues. The polymerization behavior of analogous dinuclear and mononuclear compounds is identical and consistent with a mononuclear propagating species. The isotacticity of the resulting polymers was investigated using direct integration and peak deconvolution methodologies and the two were compared.

Graphical abstract: Overcoming aggregation in indium salen catalysts for isoselective lactide polymerization

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Publication details

The article was received on 01 May 2015, accepted on 20 Jun 2015 and first published on 06 Jul 2015


Article type: Edge Article
DOI: 10.1039/C5SC01584G
Citation: Chem. Sci., 2015,6, 5284-5292
  • Open access: Creative Commons BY-NC license
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    Overcoming aggregation in indium salen catalysts for isoselective lactide polymerization

    D. C. Aluthge, J. M. Ahn and P. Mehrkhodavandi, Chem. Sci., 2015, 6, 5284
    DOI: 10.1039/C5SC01584G

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