排序方式: 共有155条查询结果,搜索用时 406 毫秒
61.
In this letter, it is shown that the applied relations in the paper by Hakan Özcan [H. Özcan, The effects of heat transfer on the exergy efficiency of an air-standard Otto cycle, Heat and Mass Transfer (2011) 47:571–577] are erroneous and thus the reported results are invalid. These incorrect relations [Eqs. (8), (9), (10), (14) and (16) of HÖ2011] are replaced by correct ones. Moreover, the obtained results (graphs and tables) are modified based on the correct relations. Finally, to achieve more realistic results, the internal irreversibility described by using the compression and expansion efficiencies is added to the analysis. 相似文献
62.
The [Pd{C6H2(CH2CH2NH2)-(OMe)2,3,4}Br(PPh3)] monomeric orthopalladate complex of homoveratrylamine and triphenylphosphine was synthesized and its application in Heck coupling reactions was investigated. This complex had been demonstrated to be more active than the corresponding dimeric catalyst for Heck reactions of aryl iodides, bromides and even chlorides and also arenesulfonyl chlorides. The cross-coupled products were produced in excellent yields using catalytic amounts of [Pd{C6H2(CH2CH2NH2)-(OMe)2,3,4}Br(PPh3)] as a thermally stable and oxygen insensitive complex in NMP at 130 °C. 相似文献
63.
Rezaei Behzad Havakeshian Elaheh Hajipour Abdol R. 《Journal of Solid State Electrochemistry》2011,15(2):421-430
The aim of this study is to introduce the application of some acidic ionic liquids (ILs) as an electrolyte additive in lead-acid
batteries. A family of alkylammonium hydrogen sulfate ILs, which are different in the number of alkyl chain, is investigated
with the aim to compare their effects on the electrochemical behavior of Pb–Sb–Sn alloy in sulfuric acid solution. The hydrogen
and oxygen gas evolution potential and anodic layer characteristics were investigated employing cyclic and linear sweep voltammetric
methods. The morphological changes of the PbSO4 layer that formed on the electrode surface were confirmed using scanning electron microscopy. Also, potentiodynamic polarization
curves, electrochemical impedance spectroscopy, and an equivalent circuit analysis were used to evaluate the corrosion behaviors
of the Pb–Sb–Sn alloy in the presence of ILs. The obtained results indicate that hydrogen and oxygen evolution overpotential
of lead–antimony–tin alloy increases in the solution containing IL and mainly depends on the number of alkyl chain in alkylammonium
cation. It is clearly observed that the morphology of PbSO4 layer changes under the influence of ILs. The corrosion studies show an increase in corrosion resistance of lead alloy in
the presence of some ILs. Also, the electrochemical effects of ILs in conversion of PbSO4 to PbO2 and vice versa were investigated by carbon-PbO paste electrode. Cyclic voltammogram of carbon-PbO electrode shows that in
the presence of ILs, oxidation and reduction peak currents increase, while reversibility decreases. 相似文献
64.
A. R Hajipour S. Habibi A. E. Ruoho 《Journal of inclusion phenomena and macrocyclic chemistry》2011,69(1-2):107-117
The novel chiral polymeric compounds containing more than one calix[4]arene have been synthesized by reacting a new calix[4]arene diamine derivative with two chiral monomers. These newly prepared compounds were studied by extraction of toxic heavy metal (Cu2+, Co2+, Cd2+, Hg2+), silver and alkali metal (Na+, K+) cations from aqueous phase. It was observed that the resulting calixarene-based polymers have a good complexing ability towards silver, alkali metal and toxic heavy metal cations. 相似文献
65.
The activity of dimeric [Pd{C6H2(CH2CH2NH2)-(OMe)2-3,4}(μ-Br)]2 and monomeric [Pd{C6H2(CH2CH2NH2)-(OMe)2-3,4}Br(PPh3)] complexes as efficient, air, and moisture tolerant catalysts was investigated in Stille and Hiyama cross-coupling reactions of various aryl halides. Substituted biaryls were produced in excellent yields in short reaction times using these complexes. The monomeric complex had been demonstrated to be more active than the corresponding dimeric catalyst for the cross-coupling of some of aryl bromides and unreactive aryl chlorides. The combination of homogenous metal catalyst, microwave irradiation, and microwave-active polar solvents gave high yields of products in short reaction times. 相似文献
66.
The present letter describes a reliable one-stage process for the preparation of sulfinate esters from the corresponding sulfinic acid and alcohols in the presence of N,N′-dicyclohexylcarbodiimide (DCC) under solvent-free conditions. 相似文献
67.
This paper describes an efficient and easy method for oxidation of sulfides 1 to their corresponding sulfoxides 2 with nitric acid in the presence of supported P2O5 on silica gel under solvent-free conditions in high yields. 相似文献
68.
A polyaniline‐functionalized multiwall carbon nanotube‐supported Cu(I) complex was developed as an efficient catalyst for the Sonogashira reactions of aryl halides with phenylacetylene in the presence of potassium hydroxide in dimethylformamide at 135 °C under nitrogen atmosphere. The corresponding products were generated in good to excellent yields using this catalytic system. Moreover, the multiwall carbon nanotube‐supported Cu(I) catalyst was simply recycled and reused for six consecutive runs. 相似文献
69.
A versatile method for the synthesis of diaryl and alkyl aryl ketones via palladium‐catalysed cross‐coupling reaction of arylboronic acids with acyl chlorides
下载免费PDF全文
![点击此处可从《应用有机金属化学》网站下载免费的PDF全文](/ch/ext_images/free.gif)
An efficient catalytic system using 1‐benzyl‐4‐aza‐1‐azoniabicyclo[2.2.2]octane chloride and PdCl2 was developed for the cross‐coupling reaction of arylboronic acids with acyl chlorides. The catalytic amount of this homogeneous catalytic system affords the corresponding diaryl and alkyl aryl ketones in good to excellent yields under mild reaction conditions. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
70.
CuFeO2/tetrabutylammonium bromide catalyzes selective synthesis of 1,4‐disubstituted 1,2,3‐triazoles in neat water at room temperature
下载免费PDF全文
![点击此处可从《应用有机金属化学》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A completely green medium including water as a solvent and antiviral CuFeO2 as a catalyst is described for the synthesis of 1,4‐disubstituted 1,2,3‐triazoles. Excellent yields of products are obtained at room temperature. Cost effectiveness, high stability and high recyclability of CuFeO2 along with antiviral properties of the catalyst make it a unique catalyst for cycloadditions of phenylacetylene with a wide variety of aryl halides. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献