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Issue 6, 2013
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Ring-opening polymerization of L-lactide catalyzed by calcium complexes

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Abstract

A series of calcium complexes supported by NNO-tridentate ketiminate ligands have been synthesized and characterized. X-ray structural studies indicate that these complexes bear a mononuclear feature with hexa-coordinated calcium centers bonding to two ketiminate ligands. Polymerization of L-lactide catalyzed by these complexes proceeds rapidly and well controlled in the presence of a variety of alcohols. In addition, these complexes reveal good catalytic activity even with the addition of up to 80 equiv. of benzyl alcohol as a transfer agent. Furthermore, kinetic studies show ROP of L-lactide is a first-order dependency on [LA] and a second-order dependency on [BnOH].

Graphical abstract: Ring-opening polymerization of l-lactide catalyzed by calcium complexes

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Publication details

The article was received on 18 Oct 2012, accepted on 01 Nov 2012 and first published on 05 Nov 2012


Article type: Paper
DOI: 10.1039/C2DT32487C
Citation: Dalton Trans., 2013,42, 2041-2051
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    Ring-opening polymerization of L-lactide catalyzed by calcium complexes

    M. Hsiao and C. Lin, Dalton Trans., 2013, 42, 2041
    DOI: 10.1039/C2DT32487C

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