Scalable synthesis of catalysts for the Mizoroki–Heck cross coupling reaction: palladium nanoparticles assembled in a polymeric nanosphere
作者:Jianli Zou、K. Swaminathan Iyer、Scott G. Stewart、Colin L. Raston
DOI:10.1039/c0nj00898b
日期:——
Palladium nano-spheres 160 nm in diameter, as an assembly of uniform 5 nm nanoparticles, are accessible using a facile one step method under continuous flow on a spinning disc with hydrogen gas as the reducing agent. The stable colloidal system is an effective catalyst for the Mizoroki–Heck reaction, as established for the reaction between several aryl halides and n-butyl acrylate, and can be readily
Ionic Pd/NHC Catalytic System Enables Recoverable Homogeneous Catalysis: Mechanistic Study and Application in the Mizoroki–Heck Reaction
作者:Dmitry B. Eremin、Ekaterina A. Denisova、Alexander Yu. Kostyukovich、Jonathan Martens、Giel Berden、Jos Oomens、Victor N. Khrustalev、Victor M. Chernyshev、Valentine P. Ananikov
DOI:10.1002/chem.201903221
日期:2019.12.20
concentrations. The present study reveals a dynamic stabilization mechanism with labile metal-NHC binding and [PdX3 ]- [NHC-R]+ ion pair formation. Access to reactive anionic palladium intermediates formed by dissociation of the NHC ligands and plausible stabilization of the molecular catalyst in solution by interaction with the [NHC-R]+ azolium ion is of particular importance for an efficient and recyclable catalyst
Amino-salicylaldimine–palladium(II) complexes: New and efficient catalysts for Suzuki and Heck reactions
作者:Jin Cui、Mingjie Zhang、Yuwei Zhang
DOI:10.1016/j.inoche.2009.10.023
日期:2010.1
alladium(II) complexes bearing 5-methyl-3-(R-1-ylmethyl)-salicylaldimine ligands (R = morpholine, piperidine, pyrrolidine, 4-methylpiperazin, diisopropylamine) have been prepared and characterized by IR, 1H NMR and elemental analysis. Crystal structure details of complex 2b have been confirmed by X-ray structure analysis. The obtained Pd(II) complexes were found to be effective catalysts for the Suzuki
摘要 制备并表征了一系列带有 5-甲基-3-(R-1-基甲基)-水杨醛亚胺配体(R = 吗啉、哌啶、吡咯烷、4-甲基哌嗪、二异丙胺)的氨基-水杨醛亚胺-钯 (II) 配合物通过 IR、1H NMR 和元素分析。配合物 2b 的晶体结构细节已通过 X 射线结构分析得到证实。发现获得的 Pd(II) 配合物是 Suzuki 和 Heck 交叉偶联反应的有效催化剂,该反应可以在空气中的未干燥溶剂中进行。
Palladium-catalyzed Mizoroki–Heck coupling reactions using sterically bulky phosphite ligand
作者:Eunhye Jung、Kyungho Park、Jaewook Kim、Hee-Tae Jung、Il-Kwon Oh、Sunwoo Lee
DOI:10.1016/j.inoche.2010.07.028
日期:2010.11
Abstract A new catalytic system based on palladium-phosphite for Mizoroki–Heck coupling reactions of aryl iodide and bromide is described. An air-stable phosphite ligand afforded the desired products with high yields in the palladium-catalyzedMizoroki–Heckreactions. The coupling of aryl iodides was optimized with 0.5 mol% Pd(OAc)2, 1 mol% phosphite 2, and K2CO3 in DMF solvent. For the coupling of
palladium in the structure of the nanocatalyst was illustrated by XRD and EDS analysis. Also using XPS technique, the oxidationstate of palladium in Pd@ABA@SPIONs@SiO2 was determined zero before and after the catalyst was applied in Mizoroki-Heck reaction. Several aryl halides and alkenes were reacted in the presence of the nanocatalyst and formed the corresponding products in high isolated yields. The
通过将钯固定在2-氨基苯甲酰胺官能化的二氧化硅包覆的超顺磁性氧化铁磁性纳米粒子上,构建了适用的钯基纳米催化剂。纳米催化剂(命名为Pd @ ABA @ SPIONs @ SiO 2)通过几种表征方法进行表征,包括扫描电子显微镜(SEM),透射电子显微镜(TEM),振动样品磁力法(VSM),能量色散X射线光谱法(EDS),动态光散射(DLS),X射线粉末衍射(XRD),傅里叶变换红外光谱(FT-IR),电感耦合等离子体(ICP)和X射线光电子能谱(XPS)分析。显微镜结果表明,纳米颗粒为球形,大小为20–25 nm。纳米颗粒的尺寸通过DLS方法确认。通过VSM方法证实了催化剂的超顺磁性。SPIONs @ SiO 2的成功功能化由FT-IR光谱证实。通过XRD和EDS分析说明了纳米催化剂结构中钯的存在。同样使用XPS技术,在将催化剂用于Mizoroki-Heck反应前后,钯在Pd @ ABA @