‘Clicking’ molecular hooks on silica nanoparticles to immobilize catalytically important metal complexes: the case of gold catalyst immobilization
作者:Anal Kr. Ganai、Rima Bhardwaj、Srinivas Hotha、Sayam Sen Gupta、B. L. V. Prasad
DOI:10.1039/c0nj00292e
日期:——
Gold mediated reactions have emerged as one of the best choices for affecting a variety of chemical transformations with a wide range of functional group tolerance. Application of such transformations to industrial processes necessitates immobilization of the Au ions into a matrix for easy separation of the catalyst after reaction. We report the synthesis and characterization of silica nanoparticles in which Au(III) has been immobilized through a 1,2,3-triazole linkage using an alkynalated picolinic acid exploiting âclick chemistryâ. The Au(III) immobilized silica nanoparticle has been thoroughly characterized using FT-IR, 13C CP MAS NMR and XPS. The utility of these particles as an easily separable catalyst for the Hashmi phenol synthesis is also reported.
金介导的反应已成为影响多种化学变化的最佳选择之一,具有广泛的官能团耐受性。将此类反应应用于工业过程需要将金离子固定在基质中,以便在反应后便于分离催化剂。我们报告了通过一种采用“点击化学”的丙炔取代的吡啶酸合成和特征化的二氧化硅纳米粒子,其中金(III)通过1,2,3-三嗪连接被固定。利用FT-IR、13C CP MAS NMR和XPS对固定金(III)的二氧化硅纳米粒子进行了全面表征。这些颗粒作为可轻松分离的Hashmi酚合成催化剂的用途也得到了报道。