Cu(<scp>ii</scp>) complex heterogenized on SBA-15: a highly efficient and additive-free solid catalyst for the homocoupling of alkynes
作者:Anand Narani、Ravi Kumar Marella、Pochamoni Ramudu、Kamaraju Seetha Rama Rao、David Raju Burri
DOI:10.1039/c3ra44213f
日期:——
A Cu(II) complex has been heterogenized on SBA-15 by functionalization of SBA-15 with (N1-propylethane-1,2-diamine) triethoxysilane (NN-SBA-15) followed by anchoring of 2-pyridinecarboxaldehyde through Schiff's base formation between the terminal –NH2 and the aldehyde group of 2-pyridinecarboxaldehyde (Py-NN-SBA-15), and finally, copper(II) was immobilized through complexation. Copper(II) complex heterogenized on SBA-15 (Cu(II)-SBA-15) has been thoroughly characterized by different techniques such as N2 sorption, small-angle X-ray diffraction (XRD), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and solid-state 13C CP-MAS NMR spectroscopy. Cu(II)-SBA-15 is an efficient heterogenized solid catalyst for the oxidative homocoupling of phenyl acetylene into 1,4-diphenylbuta-1,3-diyne with a yield of 97%, even in the absence of palladium, co-catalyst and base additives. In the case of the homocoupling of other aromatic and aliphatic terminal alkynes, the yields were 85–98%.
一个Cu(II)复合物通过对SBA-15进行功能化,使用(N1-丙基乙烯-1,2-二胺)三乙氧基硅烷(NN-SBA-15),然后通过香豆素基形成将2-吡啶甲醛锚定在终端–NH2和2-吡啶甲醛的醛基之间(Py-NN-SBA-15),最终通过络合物固定了铜(II)。在SBA-15上异质化的铜(II)复合物(Cu(II)-SBA-15)已通过多种技术进行全面表征,如N2吸附、小角X射线衍射(XRD)、热重分析(TGA)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)和固态13C CP-MAS NMR谱。Cu(II)-SBA-15是一种高效的异质固体催化剂,用于苯乙炔的氧化偶联反应,生成1,4-二苯基丁-1,3-二炔,产率为97%,甚至在没有钯、合催化剂和碱添加剂的情况下。在其他芳香族和脂肪族末端炔烃的偶联反应中,产率为85–98%。