Versatile catalytic systems based on complexes of zinc, magnesium and calcium supported by a bulky bis(morpholinomethyl)phenoxy ligand for the large-scale immortal ring-opening polymerisation of cyclic esters

Valentin Poirier; Thierry Roisnel; Jean-François Carpentier; Yann Sarazin

doi:10.1039/B917799J

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Dalton Transactions

Issue 44, 2009

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Versatile catalytic systems based on complexes of zinc, magnesium and calcium supported by a bulky bis(morpholinomethyl)phenoxy ligand for the large-scale immortal ring-opening polymerisation of cyclic esters

Valentin Poirier , Thierry Roisnel , Jean-François Carpentier and Yann Sarazin

Dalton Trans., 2009, 9820-9827

DOI: 10.1039/B917799J
Received 28 Aug 2009, Accepted 09 Sep 2009
First published on the web 28 Sep 2009

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Abstract
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A new heteroleptic ethyl-zinc complex stabilized by a chelating bis(morpholinomethyl)phenoxy ligand has been synthesised and shown to be a highly potent initiator for the immortal ring-opening polymerisation (ROP) of lactide and β-butyrolactone, being able to convert up to 50000 equiv. of monomer in the presence of up to 1000 equiv. of an alcohol as transfer agent. Two related heteroleptic complexes of magnesium and calcium have also been prepared. These complexes are stable in solution, even in the presence of large amounts of alcohol, and constitute effective catalysts for the immortal ROP of lactide under mild conditions.

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Full polymerisation data, NMR and MALDI-TOF MS data of PLLAsamples prepared with 1–3/iPrOH
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Crystal structure data
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Dalton Transactions

Versatile catalytic systems based on complexes of zinc, magnesium and calcium supported by a bulky bis(morpholinomethyl)phenoxy ligand for the large-scale immortal ring-opening polymerisation of cyclic esters

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