Synthesis of Aluminum Complexes Stabilized by Amine-Bridged Tris(phenolato) Ligands and Their Applications in the Cycloaddition Reaction of CO<sub>2</sub> and Epoxides
作者:Yuting Qing、Ziyun Tan、Hejinglong Zhang、Yanwei Wang、Yize Shi、Dan Yuan、Wenyi Li、Yingming Yao
DOI:10.1021/acs.organomet.3c00255
日期:2023.8.14
A series of amine-bridged tris(phenolato) aluminum complexes L1Al-L7Al (1–7) were synthesized through alkane elimination reactions of amino-bridged tris(phenol)s (L1Al-L7Al) with AlMe3. Complexes 1–7 were characterized through NMR, X-ray diffraction analysis, and elemental analysis. Their catalytic activities in the cycloaddition reaction of CO2 and epoxides were studied. The chloro-substituted o-
通过氨基桥联三(酚)(L 1 Al-L 7 Al )与AlMe的烷消除反应合成了一系列胺桥三(酚)铝配合物L 1 Al-L 7 Al ( 1 – 7 ) 3 . 通过NMR、X射线衍射分析和元素分析对配合物1-7进行了表征。研究了它们在CO 2与环氧化物环加成反应中的催化活性。氯代邻苯二胺桥联三(酚)铝配合物7表现出最高的催化活性。1 bar CO条件下在 2和 85 °C 下,配合物7 /TBAB 催化 15 个单取代环氧化物与 CO 2的反应,生成环状碳酸酯,产率为 52-99%。在 10 bar CO 2存在下,二取代环氧化物也可转化为环状碳酸酯,产率为 60-99% 。环氧氯丙烷(ECH) 和CO 2环加成的动力学研究揭示了对CO 2压力的零级依赖性以及对ECH、配合物7和TBAB浓度的一级依赖性。