排序方式: 共有42条查询结果,搜索用时 15 毫秒
11.
PEG-400 as an efficient reaction medium for the synthesis of 2,4,5-triaryl-1H-imidazoles and 1,2,4,5-tetraaryl-1H-imidazoles 总被引:1,自引:0,他引:1
An efficient protocol for the one-pot multicomponent synthesis of various 2,4,5-triaryl- IH-imidazoles and 1,2,4,5-tetraaryl-1H-imidazoles using PEG-400 as reaction medium is described. This method has the advantages of good yields, less pollution and simple reaction conditions. 相似文献
12.
A new free recoverable and reusable mono-alkaloid-type ligand has been synthesized by a simple method.With highly polar groups,the ligand can be recycled and reused eight times to prepare ethyl(2R,3S)-2,3-dihydroxy-3-phenylpropionate with high yield and ee via asymmetric dihydroxylation(AD) reaction. 相似文献
13.
Transmetallation reaction between hydrophobized silver nanoparticles with hydrophobized chloroaurate and chloroplatinate ions in chloroform results in the formation of hollow gold and platinum shell nanoparticles respectively. 相似文献
14.
Ilija Najdovski Dr. PR Selvakannan Dr. Anthony P. O'Mullane Prof. Suresh K. Bhargava 《Chemistry (Weinheim an der Bergstrasse, Germany)》2011,17(36):10058-10063
A rapid electrochemical method based on using a clean hydrogen‐bubble template to form a bimetallic porous honeycomb Cu/Pd structure has been investigated. The addition of palladium salt to a copper‐plating bath under conditions of vigorous hydrogen evolution was found to influence the pore size and bulk concentration of copper and palladium in the honeycomb bimetallic structure. The surface was characterised by X‐ray photoelectron spectroscopy, which revealed that the surface of honeycomb Cu/Pd was found to be rich with a Cu/Pd alloy. The inclusion of palladium in the bimetallic structure not only influenced the pore size, but also modified the dendritic nature of the internal wall structure of the parent copper material into small nanometre‐sized crystallites. The chemical composition of the bimetallic structure and substantial morphology changes were found to significantly influence the surface‐enhanced Raman spectroscopic response for immobilised rhodamine B and the hydrogen‐evolution reaction. The ability to create free‐standing films of this honeycomb material may also have many advantages in the areas of gas‐ and liquid‐phase heterogeneous catalysis. 相似文献
15.
The electrochemistry of xanthinol nicotinate(Xan) was studied by cyclic voltammetry at a glassy carbon electrode modified by a gel containing multi-walled carbon nanotubes(MWNTs) and room-temperature ionic liquid of 1-butyl-3-methylimidazolium hexafluorophosphate(BMTMPF_6).The modified electrode exhibited good promotion to the electrochemical oxidation of Xan and an ultrasensitive electrochemical method was proposed for the determination of Xan.This method was successfully applied to the determination of... 相似文献
16.
Plowman BJ O'Mullane AP Selvakannan PR Bhargava SK 《Chemical communications (Cambridge, England)》2010,46(48):9182-9184
The formation of macroporous honeycomb gold using an electrochemically generated hydrogen bubble template is described. The synthesis procedure induces the formation of highly active surfaces with enhanced electrocatalytic and surface enhanced Raman scattering properties. 相似文献
17.
Saikat Mandal P. R. Selvakannan Sumant Phadtare Renu Pasricha Murali Sastry 《Journal of Chemical Sciences》2002,114(5):513-520
Development of reliable protocols for the synthesis of nanoparticles of well-defined sizes and good monodispersity is an important
aspect of nanotechnology. In this paper, we present details of the synthesis of gold nanoparticles of good monodispersity
by the reduction of aqueous chloroaurate ions by the amino acid, aspartic acid. The colloidal gold solution thus formed is
extremely stable in time, indicating electrostatic stabilization via nanoparticle surface-bound amino acid molecules. This
observation has been used to modulate the size of the gold nanoparticles in solution by varying the molar ratio of chloroaurate
ions to aspartic acid in the reaction medium. Characterization of the aspartic acid-reduced gold nanoparticles was carried
out by UV-visible spectroscopy, thermogravimetric analysis and transmission electron microscopy. The use of amino acids in
the synthesis and stabilization of gold nanoparticle in water has important implications in the development of new protocols
for generation of bioconjugate materials. 相似文献
18.
Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in excellent yields in water.This method provides a new and efficient protocol in terms of small quantity of catalyst,a wide scope of substrates,and simple work-up procedure. 相似文献
19.
A synthesis of methyl 2-hydroxy-4-oxo-4-(substituted phenyl)butanoates has been accomplished using Friedel-Crafts acylation of substituted benzenes with 2-acetoxybutanoyl chloride.The key feature of this strategy is that various 4-arylbutanoates can be obtained conveniently,which are important intermediates for the synthesis of biologically active compounds including ACE inhibitors. 相似文献
20.
Under mild conditions, conversion of a variety of ketoximes and aldoximes to their corresponding amides and nitriles proceeded in the presence of PEG-SO3H with high yields. 相似文献