Dialkylimidazolium dimethyl phosphates as solvents and catalysts for the Knoevenagel condensation reaction
摘要:
The reaction between benzaldehyde and ethyl cyanoacetate is investigated in 1,3-dialkylimidazolium salts as solvents. The impact of both ions in these ionic liquids on the yield of the condensation reaction product is examined. Potentiometric titrations are employed for quantitative analyses of the best ionic liquids, revealing these to be 1,3-dialkylimidazolium dimethyl phosphates. (C) 2014 Elsevier Ltd. All rights reserved.
Azobenzene-Based Organic Salts with Ionic Liquid and Liquid Crystalline Properties
作者:Kathrin Stappert、Johanna Muthmann、Eike T. Spielberg、Anja-Verena Mudring
DOI:10.1021/acs.cgd.5b01024
日期:2015.9.2
carbon atoms on they form a smectic A liquid crystalline phase. The representatives of the third set with a O–C6 bridge qualify as ionicliquids with melting points less than 100 °C. However, only the representative with a hexadecyl chain forms a liquid crystalline phase. Representative single crystals for all sets of cations could be grown that allowed for single crystal structure analysis. Together
A Convenient Synthesis of Triflate Anion Ionic Liquids and Their Properties
作者:Nikolai V. Ignat’ev、Peter Barthen、Andryi Kucheryna、Helge Willner、Peter Sartori
DOI:10.3390/molecules17055319
日期:——
synthesis of high purity triflate ionic liquids via direct alkylation of organic bases (amines, phosphines or heterocyclic compounds) with methyl and ethyl trifluoromethanesulfonate (methyl and ethyl triflate) has been developed. Cheap and non-toxic dimethyl and diethyl carbonate serve as source for the methyl and ethyl groups in the preparation of methyl and ethyl triflate by this invented process. The properties
[EN] IONIC LIQUIDS BASED ON OXALIC ACID MONO ESTERS<br/>[FR] LIQUIDES IONIQUES À BASE DE MONOESTERS DE L'ACIDE OXALIQUE
申请人:BASF SE
公开号:WO2014056844A1
公开(公告)日:2014-04-17
Monosubstituted oxalic acid derivatives of the general formula (I) [A]+[O-C(O)-C(O)-O-X]-, wherein the meaning is: for [A]+, a cation made from an organic moiety A having a formally positively charged heteroatom selected from the group consisting of nitrogen, phosphorus and sulfur, X is a C1 to C30 organic residue, and wherein the following compounds (I) are disclaimed:tetramethylammonium monomethyloxalate methyltri(alkyl)ammonium monomethyloxalate trimethyl(1-hydroxyethyl)ammonium monomethyloxalate methyltriethylammonium monomethyloxalate tetraethylammonium monomethyloxalate n-propyltriethylammonium mono-n-propyloxalate n-butyltriethylammonium mono-n-butyloxalate benzyltriethylammonium monobenzyloxalate cyclohexyldimethylammonium monomethyloxalate dimethyl-phenylammonium monomethyloxalate. Tetrabutylammonium monomethyloxalate N-methylpyridinium monomethyloxalate N-ethylpyridinium monoethyloxalate N-n-propylpyridinium mono-n-propyloxalate N-n-butylpyridinium mono-n-butyl-oxalate N-benzylpyridinium monobenzyloxalate N-methyl-isochinolinium monomethyloxalate N-ethyl-isochinolinium monoethyloxalate N-n-propyl-isochinoliniummono-n-propyloxalate N-n-butyl-isochinolinium mono-n-butyloxalate N-benzyl-isochinolinium monobenzyloxalate.
Tungstate supported mesoporous silica SBA‐15 with imidazolium framework as a hybrid nanocatalyst for selective oxidation of sulfides in the presence of hydrogen peroxide
thermogravimetric analysis. The catalyst was also applied to the selectiveoxidation of various sulfides. The hybrid catalyst was easily recovered, and was very stable and retained good activity for at least five successive runs without any additional activation. Moreover, there was no remarkable decrease in the activity and selectivity of the catalyst. The products could be easily isolated by just removing
在这项工作中,制备了一种新的非均相催化剂(SBA-15 / Im / WO 4 2-),然后研究了其在有机硫化物氧化中的性能(在中性反应条件下使用30%H 2 O 2作为绿色氧化剂) )。这种有机-无机杂化介孔材料的特征在于多种技术,例如FT-IR,电感耦合等离子体,X射线粉末衍射,高分辨率透射电子显微镜,N 2吸附-解吸和热重分析。该催化剂还用于各种硫化物的选择性氧化。杂化催化剂易于回收,并且非常稳定并且在至少五个连续运行中保持了良好的活性,而没有任何额外的活化。而且,催化剂的活性和选择性没有明显降低。只需在过滤催化剂后除去溶剂即可轻松分离出产物。通过该催化剂的催化产物的产率为75%至97%。
Investigation on the Coordination Mode of IL-Supported Diols Used as Phosphine-Free Ligands for Palladium Catalyzed Heck Reaction
作者:Yueqin Cai、Gonghua Song、Xiao Chen
DOI:10.1002/cjoc.201300461
日期:2013.10
The coordinationmode of IL‐supported diolsused as phosphine‐free ligands for palladiumcatalyzedHeckreaction has been investigated by tuning their compositions. The difference in coordination of these IL‐supported diols with metal Pd in Heckreaction was related to the changes of the cation rings, leading to the different activities of Pd catalyst in the reaction. The experimental results indicated