Increased Efficacies of an Individual Catalytic Site in Clustered Multivalent Dendritic Catalysts
作者:Govindasamy Jayamurugan、Narayanaswamy Jayaraman
DOI:10.1002/adsc.200900377
日期:2009.10
as many as 11 catalysts within three generations were synthesized. The CC bond-forming reactions, namely, the Heck and the Suzuki coupling reactions, were then selected to study the catalytic efficiencies of the series of partially and fully phosphine-metal complex functionalized dendrimers. The efficacies of the formation of cinnamate and biphenyl, catalyzed by the dendritic catalysts, were compared
迄今为止,在有关树状聚合物介导的催化作用的研究报告中,主要研究了催化单元的效率,并比较了各个世代。为了确定单个催化单元相对于给定世代中存在的此类单元的数量的功效,在一代内制备了一系列催化剂。选择与膦金属配合物结合的树枝状聚合物进行研究,并在三代内合成了多达11种催化剂。然后选择CC键形成反应,即Heck和Suzuki偶联反应,以研究一系列部分和完全膦-金属配合物官能化的树枝状聚合物的催化效率。比较了树状催化剂催化肉桂酸酯和联苯形成的效率。比较分析表明,当以多个数量存在时(即在多价树状体系中),单个催化位点的催化活性要比在同一世代(即在一价树状系统中)中的单个单元有效得多。这项研究确定了在树状聚合物世代之内和之间以及树状聚合物世代中催化部分多价呈递的有益作用。