Palladium-coated nickel nanoclusters: new Hiyama cross-coupling catalysts.
Palladium-coated nickel nanoclusters: new Hiyama cross-coupling catalysts.
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DOI：
10.1039/b513587g
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发表时间：
2006-12
期刊：
影响因子：
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通讯作者：
L. Durán Pachón;M. Thathagar;F. Hartl;G. Rothenberg
中科院分区：
文献类型：
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作者：
L. Durán Pachón;M. Thathagar;F. Hartl;G. Rothenberg
讨论了双金属纳米粒子作为C-C偶联催化剂的优点，提出了一种简单、自下而上合成核壳结构Ni-Pd簇合物的方法。这种方法结合了电化学和“湿化学”技术，能够制备高度单分散的双金属纳米团簇。对双阳极电解槽进行了详细的介绍。然后将核壳结构的Ni-Pd簇合物用于苯基三甲氧基硅烷与各种卤代芳烃的Hiyama交叉偶联反应。用各种碘和溴代芳基得到了良好的产物产率。我们发现，对于一定数量的Pd原子，核壳结构的性能优于单金属Pd结构和合金双金属Ni-Pd结构。四氢呋喃是该工艺的优良溶剂，其同偶联度低于2%。讨论了稳定剂和溶剂的作用。
The advantages of bimetallic nanoparticles as C-C coupling catalysts are discussed, and a simple, bottom-up synthesis method of core-shell Ni-Pd clusters is presented. This method combines electrochemical and 'wet chemical' techniques, and enables the preparation of highly monodispersed structured bimetallic nanoclusters. The double-anode electrochemical cell is described in detail. The core-shell Ni-Pd clusters were then applied as catalysts in the Hiyama cross-coupling reaction between phenyltrimethoxysilane and various haloaryls. Good product yields were obtained with a variety of iodo- and bromoaryls. We found that, for a fixed amount of Pd atoms, the core-shell clusters outperform both the monometallic Pd clusters and the alloy bimetallic Ni-Pd ones. THF is an excellent solvent for this process, with less than 2% homocoupling by-product. The roles of the stabiliser and the solvent are discussed.