Ring-opening polymerization of lactide with Zr complexes of {ONSO} ligands: From heterotactically inclined to isotactically inclined poly(lactic acid)

Ayellet Stopper; Jun Okuda; Moshe Kol

doi:10.1021/ma2023364

Ring-opening polymerization of lactide with Zr complexes of {ONSO} ligands: From heterotactically inclined to isotactically inclined poly(lactic acid)

Ayellet Stopper, Jun Okuda, Moshe Kol

School of Chemistry

Tel Aviv University

Research output: Contribution to journal › Article › peer-review

Abstract

Six members of a new family of {ONSO}-type ligands - the tetradentate-diainionic imine-thiobis(phenolate) ligands - were prepared by a two-step synthesis. Their [{ONSO}Zr(O ^tBu) ₂] complexes formed as single diastereomers with different degrees of fluxionality that depended on the substitution pattern of the two phenolate rings. The complexes were active in polymerization of l-lactide and rac-lactide. The tacticity of the poly(lactic acid) prepared from rac-lactide changed gradually from heterotactically inclined through atactic to isotactically inclined. The most flexible complex and the most rigid complex gave the highest degrees of heterotacticity and isotacticity, respectively.

Original language	English
Pages (from-to)	698-704
Number of pages	7
Journal	Macromolecules
Volume	45
Issue number	2
DOIs	https://doi.org/10.1021/ma2023364
State	Published - 24 Jan 2012

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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abstract = "Six members of a new family of {ONSO}-type ligands - the tetradentate-diainionic imine-thiobis(phenolate) ligands - were prepared by a two-step synthesis. Their [{ONSO}Zr(O tBu) 2] complexes formed as single diastereomers with different degrees of fluxionality that depended on the substitution pattern of the two phenolate rings. The complexes were active in polymerization of l-lactide and rac-lactide. The tacticity of the poly(lactic acid) prepared from rac-lactide changed gradually from heterotactically inclined through atactic to isotactically inclined. The most flexible complex and the most rigid complex gave the highest degrees of heterotacticity and isotacticity, respectively.",

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AU - Kol, Moshe

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N2 - Six members of a new family of {ONSO}-type ligands - the tetradentate-diainionic imine-thiobis(phenolate) ligands - were prepared by a two-step synthesis. Their [{ONSO}Zr(O tBu) 2] complexes formed as single diastereomers with different degrees of fluxionality that depended on the substitution pattern of the two phenolate rings. The complexes were active in polymerization of l-lactide and rac-lactide. The tacticity of the poly(lactic acid) prepared from rac-lactide changed gradually from heterotactically inclined through atactic to isotactically inclined. The most flexible complex and the most rigid complex gave the highest degrees of heterotacticity and isotacticity, respectively.

AB - Six members of a new family of {ONSO}-type ligands - the tetradentate-diainionic imine-thiobis(phenolate) ligands - were prepared by a two-step synthesis. Their [{ONSO}Zr(O tBu) 2] complexes formed as single diastereomers with different degrees of fluxionality that depended on the substitution pattern of the two phenolate rings. The complexes were active in polymerization of l-lactide and rac-lactide. The tacticity of the poly(lactic acid) prepared from rac-lactide changed gradually from heterotactically inclined through atactic to isotactically inclined. The most flexible complex and the most rigid complex gave the highest degrees of heterotacticity and isotacticity, respectively.

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M3 - مقالة

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JO - Macromolecules

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IS - 2

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Ring-opening polymerization of lactide with Zr complexes of {ONSO} ligands: From heterotactically inclined to isotactically inclined poly(lactic acid)

Abstract

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