Reduction of diaryl alkenes by hypophosphorous acid–iodine in acetic acid
摘要:
A mixture of 50% aqueous H3PO2 and I-2 (in catalytic amount) in HOAc efficiently reduces aryl alkenes to the corresponding alkanes in high yield. Addition of acetic anhydride to the medium results in ring-acetylation (or N-acetylation in the case of amines). H3PO2 costs only one-fifth as much as hydriodic acid on a mole basis and one mole of H3PO2 produces four moles of FIT, resulting in a 20-fold cost advantage for H3PO2/I-2 over aqueous HI as a source of HI, (C) 2002 Elsevier Science Ltd, All rights reserved.
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,
A Bifunctional Iron Nanocomposite Catalyst for Efficient Oxidation of Alkenes to Ketones and 1,2-Diketones
作者:Tao Song、Zhiming Ma、Peng Ren、Youzhu Yuan、Jianliang Xiao、Yong Yang
DOI:10.1021/acscatal.9b05197
日期:2020.4.17
sites of Fe–Nx and Fe phosphate, as oxidation and Lewis acid sites, were simultaneously integrated into a hierarchical N,P-dual doped porous carbon. As a bifunctional catalyst, it exhibited high efficiency for direct oxidativecleavage of alkenes into ketones or their oxidation into 1,2-diketones with a broad substrate scope and high functional group tolerance using TBHP as the oxidant in water under
2-(1-Aryliminoethyl)cycloheptapyridylpalladium complexes: Synthesis, characterization and the use in the Heck-reaction
作者:Bin Ye、Lin Wang、Xinquan Hu、Carl Redshaw、Wen-Hua Sun
DOI:10.1016/j.ica.2013.08.008
日期:2013.10
reacted with PdCl 2 (CH3 CN) 2 in dichloromethane to form the respective palladium(II) complexes ( C1 – C7 ). All organic and palladium compounds were characterized by FT-IR and NMR spectroscopy, as well as by elemental analysis. The molecular structures of the complexes C4 , C5 and C7 were determined by single crystalX-ray diffraction studies and revealed distorted square geometries at each palladium
The synthesis and applications of a micro-pine-structured nanocatalyst
作者:Vivek Polshettiwar、Mallikarjuna N. Nadagouda、Rajender S. Varma
DOI:10.1039/b814715a
日期:——
Dendritic nanoferrites with a micro-pine morphology have been synthesized for the first time under microwave irradiation conditions without using any reducing or capping reagent; the nanoferrites were then functionalized and coated with Pd metal, which catalyzes various organic transformations.
Copper/Palladium-Cocatalyzed Aerobic Synthesis of Bisaryl Ketones from Olefins<i>via</i>C-C Double Bonds Cleavage
作者:Lijun Gu、Jiyan Liu、Hongtao Zhang
DOI:10.1002/cjoc.201400483
日期:2014.12
A novel palladium/copper‐catalyzed aerobicsynthesis of bisaryl ketones from 1,2‐diarylalkenes via C‐C double bonds cleavage has been described. This reaction constitutes a new transformation from 1,2‐diarylalkenes into bisaryl ketones, providing a unifying, simple and environmentally friendly complement to the available methods.