Issue 10, 2011
From the journal:

Polymer Chemistry

Controlled stereoselective polymerization of lactide monomers by group 4 metal initiators that contain an (OSSO)-type tetradentate bis(phenolate) ligand†

Jean-Charles Buffet,a   Ashley N. Martin,a   Moshe Kolb  and  Jun Okuda*a  

* Corresponding authors

a Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, Aachen, Germany
E-mail: jun.okuda@ac.rwth-aachen.de
Fax: +49 241 80 92 644

b School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Ramat Aviv, Tel Aviv, Israel

Abstract

Group 4 metal complexes Zr-1 to Zr-4, Ti-4 and Ti-4a that contain an (OSSO)-type tetradentate bis(phenolate) ligand were found to initiate the ring-opening polymerization of meso-, rac-, and L-lactides in toluene solution. The polymerizations were controlled with initiator efficiency values around one and gave polymers with low polydispersity (Mw/Mn < 1.2). The polylactides were atactic when rac-lactide was used as the monomer and heterotactic biased when meso-lactide was used. Kinetic measurements showed that meso-lactide was polymerized generally faster than rac- and L-lactide.

Graphical abstract: Controlled stereoselective polymerization of lactide monomers by group 4 metal initiators that contain an (OSSO)-type tetradentate bis(phenolate) ligand

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Article information

DOI
https://doi.org/10.1039/C1PY00266J
Article type
Paper
Submitted
10 Jun 2011
Accepted
17 Jul 2011
First published
15 Aug 2011

Polym. Chem., 2011,2, 2378-2384

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Controlled stereoselective polymerization of lactide monomers by group 4 metal initiators that contain an (OSSO)-type tetradentate bis(phenolate) ligand

J. Buffet, A. N. Martin, M. Kol and J. Okuda, Polym. Chem., 2011, 2, 2378 DOI: 10.1039/C1PY00266J

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