Tetrakis(2-hydroxyphenyl)ethene and Derivatives. A Structurally Preorganized Tetradentate Ligand System for Polymetallic Coordination Chemistry and Catalysis
作者:Udo Verkerk、Megumi Fujita、Trevor L. Dzwiniel、Robert McDonald、Jeffrey M. Stryker
DOI:10.1021/ja027436u
日期:2002.8.1
chemistry has been developed: tetrakis(2-hydroxyphenyl)ethene (1a) and substituted derivatives. The design exploits the planarity of the tetraphenylethylene core to impart rigidity to the roughly square oxygen binding array, while maintaining a degree of conformational mobility associated with rotation about the aryl-ethylene carbon-carbon bonds. Tetrakis(2-hydroxyphenyl)ethene derivatives are designed to promote
已开发出一种用于多金属配位化学的拓扑独特、构象受限的四齿配体系统:四(2-羟基苯基)乙烯 (1a) 和取代衍生物。该设计利用四苯基乙烯核的平面性为大致方形的氧结合阵列赋予刚性,同时保持与围绕芳基-乙烯碳-碳键旋转相关的一定程度的构象迁移率。四(2-羟基苯基)乙烯衍生物旨在通过螯合配位模式促进多种金属桥接。配体由苯甲醚或 4-叔丁基苯甲醚通过 2,2'-二甲氧基二苯甲酮腙 4a,b 分四步合成。通过使用过氧化镍氧化腙原位制备的相应二芳基重氮甲烷的酸催化分解,以高产率制备空间位阻邻位取代的四苯基乙烯核。使用三溴化硼对甲基醚进行脱保护得到四(2-羟基苯基)乙烯(1a),通过 X 射线晶体学表征,和四(5-叔丁基-2-羟基苯基)乙烯(1b)。3-位上的空间隔离取代基可以通过克莱森重排/氢化安装,有效地提供四(3-n-丙基-2-羟基苯基)乙烯(6)。为了说明这种前所未有的配体类别的潜在应用,报道了两