Highly heteroselective ring-opening polymerization of racemic lactide initiated by divalent ytterbium complexes bearing amino bis(phenolate) ligands

Sheng Yang; Zhu Du; Yong Zhang; Qi Shen

doi:10.1039/C2CC34451C

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Chemical Communications

Issue 78, 2012

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Highly heteroselective ring-opening polymerization of racemic lactide initiated by divalent ytterbium complexes bearing amino bis(phenolate) ligands

Sheng Yang,^a Zhu Du,^a Yong Zhang^a and Qi Shen*^a^b

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Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China
E-mail: qshen@suda.edu.cn ;
Fax: +86-512-65880305

State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People's Republic of China

Chem. Commun., 2012,48, 9780-9782

DOI: 10.1039/C2CC34451C
Received 21 Jun 2012, Accepted 10 Aug 2012
First published online 13 Aug 2012

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Polymerization of racemic lactide initiated by divalent ytterbium complexes supported by either dimethylamino-amino bis(phenolate) or methoxy-amino bis(phenolate) ligands proceeds rapidly at room temperature in a living fashion to give heterotactic polylactide with the racemic enchainment of monomer units P_r ranging from 0.97–0.99.

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Highly heteroselective ring-opening polymerization of racemic lactide initiated by divalent ytterbium complexes bearing amino bis(phenolate) ligands

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Highly heteroselective ring-opening polymerization of racemic lactide initiated by divalent ytterbium complexes bearing amino bis(phenolate) ligands

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