Well-defined bis(phenolate) lanthanide methoxides as efficient initiators for the polymerization of cyclic carbonate and lactide  

作　　者：XU XiaoPing YAO YingMing ZHANG Yong SHEN Qi 

机构地区：[1]Key Laboratory of Organic Synthesis of Jiangsu Province, Department of Chemistry and Chemical Engineering, Dushu Lake Campus, Suzhou University, Suzhou 215123, China [2]State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022, China

出　　处：《Chinese Science Bulletin》2007年第12期1623-1628,共6页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 20472063);the Innovation Project of Graduate Education of Jiangsu Province;the State Key Laboratory of Polymer Physics and Chemistry;the Key Laboratory of Organic Synthesis of Jiangsu Province

摘　　要：Lanthanide methoxides supported by carbon-bridged bis(phenolate) ligands 2,2′-methylene-bis(6-tert- butyl-4-methylphenoxo) (MBMP2-) [(MBMP)Ln( μ-OMe)(THF)2]2 (Ln = Nd (1), Yb (2)) were synthesized in high yields by the protolysis reaction using (C5H5)3Ln(THF) as starting materials, and complex 1 was structurally characterized. The coordination geometry around the center metal can be best described as a distorted octahedron. Complexes 1 and 2 were shown to be efficient initiators for the ring-opening polymerization of 2,2-dimethyltrimethylene carbonate (DTC) and L-lactide. The mechanism of DTC polymerization was explored by the end group analysis of the oligomer.Lanthanide methoxides supported by carbon-bridged bis（phenolate） ligands 2,2′-methylene-bis（6-tertbutyl-4-methylphenoxo） （MBMP^2） [（MBMP）Ln（μ-OMe）（THF）2]2 （Ln = Nd （1）, Yb （2））were synthesized in high yields by the protolysis reaction using （C5H5）3Ln（THF） as starting materials, and complex 1 was structurally characterized. The coordination geometry around the center metal can be best described as a distorted octahedron. Complexes 1 and 2 were shown to be efficient initiators for the ring-opening polymerization of 2,2-dimethyltrimethylene carbonate （DTC） and L-lactide. The mechanism of DTC polymerization was explored by the end group analysis of the oligomer.

关 键 词：稀土元素甲醇盐 二苯酚盐配体 丙交酯 碳酸盐 聚合物 

分 类 号：O634[理学—高分子化学]