Allen Daryl P, Van Wingerden Matthew M, Grubbs Robert H
The Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Org Lett. 2009 Mar 19;11(6):1261-4. doi: 10.1021/ol9000153.
Two triethoxysilyl-functionalized N-heterocyclic carbene ligands have been synthesized and used to prepare the corresponding second-generation ruthenium olefin metathesis catalysts. These complexes were then grafted onto silica gel, and the resulting materials were efficient heterogeneous catalysts for a number of metathesis reactions. The solid-supported catalysts were shown to be recyclable over a number of reaction cycles, and no detectable levels of ruthenium were observed in reaction filtrates (ruthenium concentration of filtrate <5 ppb).
已经合成了两种三乙氧基甲硅烷基官能化的N-杂环卡宾配体，并用于制备相应的第二代钌烯烃复分解催化剂。然后将这些配合物接枝到硅胶上，所得材料是用于许多复分解反应的高效多相催化剂。结果表明，固体负载型催化剂在多个反应循环中均可循环使用，并且在反应滤液中未观察到可检测水平的钌（滤液中钌浓度<5 ppb）。
