Zinc complexes supported by multidentate aminophenolate ligands: synthesis, structure and catalysis in ring-opening polymerization of rac-lactide
作者:Liying Wang、Haiyan Ma
DOI:10.1039/c0dt00250j
日期:——
donors of the ligand and silylamido or ethyl group interact with zinc center constructing a distorted tetrahedral coordination geometry at the metal center. All these zinc complexes efficiently initiated the ring-opening polymerization of rac-lactide, and the polymerization runs were better controlled in the presence of isopropanol, giving atactic PLAs end-capped with isopropyl ester and hydroxyl groups
单体的 硅烷基铝锌 和乙基配合物带有四齿 氨基酚 配体[(D NNO)ZnR](D =NMe 2,OMe; R =N(SiMe 3)2(1-5,8),等(6,7,9,10)),从反应中分离Zn [N(SiMe 3)2 ] 2 或者 锌2和一当量的氨基酚芳基-CH 2 N [(CH 2)2 NMe 2 ] CH 2-苯酚},中等至高收率。这些配合物的单体性质通过X射线衍射研究进一步证实水飞蓟素复合物1,3和乙基络合物7,9,10。芳基单元的甲氧基或N,N-二甲基氨基不与固态的金属中心配位,只有配体的其余三个供体和水飞蓟素 或乙基与 锌中心在金属中心构造扭曲的四面体配位几何。所有这些锌配合物有效地启动的开环聚合外消旋-丙交酯的存在下,可以更好地控制聚合过程 异丙醇,得到无规PLA末端封端有异丙酯和 羟组。辅助配体的结构对相应催化剂的催化活性和选择性有一定影响。锌复合体。引入笨重的邻苯氧基单元