期刊
MACROMOLECULES
卷 45, 期 2, 页码 698-704出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma2023364
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资金
- German Israeli Foundation (G.I.F.)
- Britain-Israel Research and Academic Exchange Partnership (BIRAX) foundation
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((OBu)-Bu-t)(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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