Ligand free, highly efficient synthesis of diaryl ether over copper fluorapatite as heterogeneous reusable catalyst
作者:Shafeek A.R. Mulla、Suleman M. Inamdar、Mohsinkhan Y. Pathan、Santosh S. Chavan
DOI:10.1016/j.tetlet.2012.01.124
日期:2012.4
A novel ligand-free, highlyefficient, and an inexpensive method has been developed by using ecofriendly, heterogeneous reusable copper fluorapatite (CuFAP) catalyst for the synthesis of diaryl ethers from the cross coupling reaction of the various substituted aryl halides (fluoride, chloride, bromide, and iodide) with the potassium salts of various substituted phenols in the presence of N-methyl 2-pyrrolidone
Synthesis of polyphosphazenes with sulfonimide side groups
申请人:The Penn State Research Foundation
公开号:US20040225153A1
公开(公告)日:2004-11-11
The invention relates to sulfonimide bearing phenolic compounds and the use of those compounds to produce polyphosphazenes functionalized by one or more of those compounds alone, or in combination with cosubstituents. The invention also relates to blends of sulfonimide functionalized phosphazene polymers with other polymers, membranes formed of the functionalized polymers, and the use of those membranes in devices such as fuel cells.
Studies of the Thiocarbonyl Compounds. I. Syntheses and Thermal Rearrangement of<i>O</i>,<i>S</i>-Diaryl Dithiocarbonates
作者:Yoshiaki Araki
DOI:10.1246/bcsj.43.252
日期:1970.1
S-diaryl dithiocarbonates with the general formula of p-X–C6H4–S–C(=S)–O–C6H4–Y-p (I) were prepared. When these substances were kept at an elevated temperature, they rearranged smoothly to S,S-diaryl dithiocarbonates of this general formula: p-X–C6H4–S–C(=O)–S–C6H4-Y-p (II). Kinetic studies showed that the rearrangement followed fairly good first-order kinetics. The rate constants in diphenyl ether at
Enthalpy-Entropy Correlations in Reactions of Aryl Benzoates with Potassium Aryloxides in Dimethylformamide
作者:Irina A. Khalfina、Vladislav M. Vlasov
DOI:10.1002/kin.20763
日期:2013.4
concluded that the reactions of aryl benzoates PhCO2C6H4Y with potassium aryloxides in DMF proceed via a four‐step mechanism. The large ρ0(Y) and ρXY values at 25°C obtained for the reactions of 1–3 with potassium aryloxides with an electron‐donating substituent refer to the rate‐determining formation of the spiro‐σ‐complex. The Hammettplots for the reactions of 1 and 2 exhibit a downward curvature, causing
钾芳氧化物XC的相对反应性的温度依赖性6 ħ 4 ö - ķ +朝向4-硝基苯基(1),3-硝基苯基(2),4-氯苯基(3),和苯基(4)在二甲基甲酰胺苯甲酸酯(DMF)使用竞争反应技术进行了研究。1与4-氰基苯酚钾,2与3-溴苯酚钾,3与3-溴苯酚,4-溴苯酚和未取代的苯酚钾的反应的速率常数k X,4在25°C下用4-甲氧基钾和3-甲基苯酚钾测定。相对速率常数k X / k H(3-Me)与竞争性反应的活化参数差异(∆∆Н ≠和∆∆ S ≠)的相关分析表明存在六个等速序列。我们研究了X对每个等动力学系列的活化参数的取代基效应,并得出结论,苯甲酸芳基酯PhCO 2 C 6 H 4 Y与芳基氧化钾在DMF中的反应通过四步机理进行。大ρ 0(Y)和ρ XY1–3与带有给电子取代基的芳基氧化钾反应在25°C下获得的值是确定螺-σ-络合物形成速率的速率。1和2反应的Hammett图表现出向下的曲率
Synthesis, Characterization, and Biologic Activity of New Acyl Hydrazides and 1,3,4-Oxadiazole Derivatives
Starting from isoniazid and carboxylic acids as precursors, thirteen new hydrazides and 1,3,4-oxadiazoles of 2-(4-substituted-phenoxymethyl)-benzoic acids were synthesized and characterized by appropriate means. Their biological properties were evaluated in terms of apoptosis, cell cycle blocking, and drug metabolism gene expression on HCT-8 and HT-29 cell lines. In vitro antimicrobial tests were performed