Palladium 2-mercapto-<i>N</i>-propylacetamide complex anchored onto MCM-41 as efficient and reusable nanocatalyst for Suzuki, Stille and Heck reactions and amination of aryl halides
A palladium 2‐mercapto‐N‐propylacetamide complex supported on functionalized MCM‐41 was prepared by a post‐grafting method and considered as an efficientcatalyst for CC cross‐coupling reactions between various arylhalides and sodium tetraphenylborate, phenylboronic acid, triphenyltin chloride or alkenes. Also, this catalyst shows good reactivity towards amination of arylhalides. This nanocatalyst
Air‐Stable Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>‐EDTA‐Ni(0) as an Efficient Recyclable Magnetic Nanocatalyst for Effective Suzuki‐Miyaura and Heck Cross‐Coupling via Aryl Sulfamates and Carbamates
The synthesis of inexpensive and novel air‐stable Ni(0) nanoparticles immobilized on the EDTA‐modified Fe3O4@SiO2 nanocatalyst was investigated in Suzuki‐Miyaura and Heckcross‐couplingreactions. This catalytic system displayed a greatly improved substrate scope for the carbon–carbon bond formations starting from a wide range of green and economical electrophiles aryl and heteroaryl carbamates and
廉价且新颖的,稳定的,稳定在EDTA修饰的Fe 3 O 4 @SiO 2上的Ni(0)纳米颗粒的合成在Suzuki-Miyaura和Heck交叉偶联反应中研究了纳米催化剂。该催化体系通过在温和,操作简单的反应条件下通过高效方法,从广泛的绿色和经济亲电氨基甲酸酯和杂芳基氨基甲酸酯和氨基磺酸盐开始,显着改善了碳-碳键形成的底物范围。合成的多相催化剂还通过FT-IR,TEM,XRD,DLS,FE-SEM,UV-Vis,EDX,XPS,TGA,NMR,VSM,ICP和元素分析技术进行了全面表征。可以通过外部磁场容易地回收异质磁性纳米催化剂,并且在催化剂的沥滤可忽略不计并且活性没有实质性降低的情况下,至少七次重复用于接下来的反应至少七次。所有这些亮点使本协议变得有趣,
Safe Palladium-Catalyzed Cross-Couplings with Microwave Heating Using Continuous-Flow Silicon Carbide Reactors
silicon carbide (SiC) tube reactor for use in a commercially available microwave heated continuous-flow system. The SiC flow reactor enables palladium(0)-catalyzed reactions that, due to precipitation and subsequent hot spot formation, often followed by reactor failure, are unsuitable to conduct in standard microwave-transparent borosilicate glass reactors. We report continuous-flow protocols for the Mizoroki–Heck
Easy-separable magnetic nanoparticle-supported Pd catalysts: Kinetics, stability and catalyst re-use
作者:Urszula Laska、Christopher G. Frost、Gareth J. Price、Pawel K. Plucinski
DOI:10.1016/j.jcat.2009.10.001
日期:2009.12.10
novel palladium-based catalysts supported on magnetic nanoparticles with diameters of 7–17 nm have been prepared and evaluated in C–C coupling, hydrogenation and amination reactions. One type of catalyst used palladium complexes containing phosphine and/or acetate ligands for applications in Suzuki and Heck reactions. The second type consisted of Pd(0)-functionalised magnetic cores for use in hydrogenation
In this paper, we report a simple, facile and efficient method for the synthesis of Fe3O4/SiO2‐DTZ‐Pd. The immobilized palladium was an efficient catalyst without addition of phosphine ligands for Stille, Heck and N‐arylation reactions. This method has some advantages such as high yields and easy work up of products. In addition, the catalyst can be recovered using a magnet and reused several times
在本文中,我们报告了一种简单,方便,有效的合成Fe 3 O 4 / SiO 2 -DTZ-Pd的方法。固定的钯是一种有效的催化剂,无需添加用于Stille,Heck和N-芳基化反应的膦配体。该方法具有诸如高收率和易于产品加工的优点。另外,可以使用磁体回收催化剂并重复使用几次,而不会显着降低其催化活性。该催化剂具有多种物理化学技术的特征,例如扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线衍射(XRD)和电感耦合等离子体(ICP)。