N-heterocyclic carbene-Pd(II) complex based on theophylline supported on Fe3O4@SiO2 nanoparticles: Highly active, durable and magnetically separable catalyst for green Suzuki-Miyaura and Sonogashira-Hagihara coupling reactions
作者:Mohsen Esmaeilpour、Ali Reza Sardarian、Habib Firouzabadi
DOI:10.1016/j.jorganchem.2018.08.002
日期:2018.10
phosphine-free Pd catalyst for the Sonogashira cross-coupling of aryl halides (I, Br, Cl) with terminal aromatic and aliphatic alkynes under solvent-free conditions. All coupling reactions proceeded with good to excellent yields. The catalyst showed good stability and was recovered and reused for eight reaction cycles without a significant loss in its catalytic activity. Also, the leaching of the catalyst has been
本文通过将基于茶碱的N-杂环卡宾-Pd(II)配合物固定在磁性Fe 3 O 4 @SiO 2纳米粒子上,合成了一种新型的非均相钯催化剂。通过傅立叶变换红外光谱(FT-IR),X射线衍射(XRD),X射线光电子能谱(XPS),能量色散X射线分析(EDX),热重分析(TGA)对合成的磁性复合材料进行表征振动样品磁力计(VSM),透射电子显微镜(TEM),场发射扫描电子显微镜(FE-SEM),动态光散射(DLS),N 2吸附-解吸等温线分析(BET),紫外可见光谱和元素分析。另外,通过电感耦合等离子体(ICP)分析来测量钯在催化剂上的负载量。合成的催化剂已成功用于各种芳基卤化物(I,Br,Cl)与苯基硼酸的Suzuki交叉偶联反应。该反应最好在60°C下仅在0.37–0.5 mol%的催化剂存在下于绿色溶剂水中进行。同样,我们已经报道了这种可循环使用的催化体系,它是在无溶剂条件下,将芳基卤化物(