Wang Xin, Chang Zhiduo, Jing Xu, He Cheng, Duan Chunying
State Key Laboratory of Fine Chemicals, Zhang Dayu College of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China.
ACS Omega. 2019 Jun 21;4(6):10828-10833. doi: 10.1021/acsomega.9b00742. eCollection 2019 Jun 30.
As common coinage metals, silver and silver compounds have very rich application in the organic catalytic reaction. Immobilization of silver compounds on heterogeneous media is the most common way used in industrial catalytic reactions. In this work, we designed and synthesized a new heterogeneous porous silver catalyst, with in situ-formed Ag-S rods as connecting nodes and thiosemicarbazide-functionalized linear ligands, used in both σ- and π-catalytic transformations. Strong Ag-S bonds bypassed the loss of noble silver elements and inhibited the formation of nonporous silver particles which always led to the decrease of yields in homogenous reactions. Furthermore, various derivatives of propargylamines and phenylacetylenes were applied as both σ and π-active substrates with moderate to good yields.
作为常见的货币金属，银及其化合物在有机催化反应中有着非常广泛的应用。将银化合物固定在多相介质上是工业催化反应中最常用的方法。在这项工作中，我们设计并合成了一种新型的多相多孔银催化剂，它以原位形成的Ag-S棒作为连接节点，并带有硫代氨基脲官能化的线性配体，可用于σ催化和π催化转化。强大的Ag-S键避免了贵金属银元素的损失，并抑制了无孔银颗粒的形成，而无孔银颗粒的形成往往会导致均相反应产率的降低。此外，炔丙胺和苯乙炔的各种衍生物作为σ活性和π活性底物，产率适中至良好。
