Highly Robust Yttrium Bis(phenolate) Ether Catalysts for Excellent Isoselective Ring-Opening Polymerization of Racemic Lactide

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• 作者：Tie-Qi XuGuan-Wen Yang ; Chuang Liu ; Xiao-Bing Lu
• 刊名：Macromolecules
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：50
• 期：2
• 页码：515-522
• 全文大小：484K
• ISSN：1520-5835

文摘

The highly isoselective ring-opening polymerization (ROP) of racemic lactide is regarded as a valuable strategy for the synthesis of stereocomplex polylactide. In the present contribution, we report the novel yttrium bis(phenolate) ether complexes for catalyzing ROP of racemic lactide in high activity (TOF) and excellent isotactic selectivity (P_i) (P_i = 0.90, TOF = 120 h^–1 at −15 °C; P_i = 0.84, TOF = 2280 h^–1 at 25 °C). Kinetic and computational studies provide a fundamental understanding of the stereocontrol mechanism governing polymerization reactions mediated by yttrium catalysts.