63458-90-2Relevant academic research and scientific papers
Solid supported type ion liquid catalytic synthesis of stearic acid pentaerythritol ester of method
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Paragraph 0022-0023, (2019/07/04)
The present invention discloses a solid supported ionic liquid catalytic synthesis of stearic acid pentaerythritol ester of method, characterized in that in order to stearic acid and pentaerythritol as the raw materials, to solid supported type imidazole ion liquid as the use of the catalyst. The invention adopts the sol-gel process solid-ionic liquid, the catalyst amount is alcohol, acid always mole number of 1% - 5%, the reaction temperature is at 110 - 170 °C, normal pressure, reaction time 1 - 5 h; the characteristic of this invention is not adopted the pollution to the environment of the concentrated sulfuric acid, with the traditional inorganic acid as compared with the catalyst, solid-ionic liquid has high catalyst activity, mild reaction, esterification rate high, obtained by the production process is simplified, catalyst recovery simple operation and the like.
The effect of an electron-withdrawing group in the imidazolium cation: The case of nitro-functionalized imidazolium salts as acidic catalysts for the acetylation of glycerol
Morais, Eduardo M.,Grillo, Igor B.,Stassen, Hubert K.,Seferin, Marcus,Scholten, Jackson D.
, p. 10774 - 10783 (2018/07/05)
The acetylation of glycerol was achieved with high conversion and selectivity towards triacetin at low temperatures and short reaction times by using acidic imidazolium salts as catalysts. Moreover, the addition of a nitro group to the imidazolium cation affords a much more competent catalyst, indicating a significant effect provided by the simple electronic change in the imidazolium cation. Theoretical calculations revealed increased polarization of the acidic hydrogen bond on the nitrated salts, which may be related to their superior catalytic behavior when compared to the non-functionalized salts. Combining the preliminary experimental and theoretical results, it is possible to suppose that the catalytic activity of acidic imidazolium salts may be better comprehended by its Br?nsted acidities, but other parameters such as hardness, electronegativity, electrophilicity and ion-pair binding energy were also evaluated in order to investigate their effects in the acetylation of glycerol promoted by these acidic imidazolium salts.
Acidic-functionalized ionic liquid as an efficient, green and reusable catalyst for hetero-Michael addition of nitrogen, sulfur and oxygen nucleophiles to α,β-unsaturated ketones
Han, Feng,Yang, Lei,Li, Zhen,Xia, Chungu
experimental part, p. 346 - 354 (2012/01/14)
A series of acidic-functionalized ionic liquids were synthesized and applied to the hetero-Michael addition of nitrogen, sulfur and oxygen nucleophiles to α,β-unsaturated ketones under solvent-free conditions. Notably, 1-methylimidazolium p-toluenesulfoni
Tunable protic ionic liquids as solvent-catalysts for improved synthesis of multiply substituted 1,2,4-triazoles from oxadiazoles and organoamines
Chen, Xiaofeng,Liu, Rui,Xu, Yuan,Zou, Gang
body text, p. 4813 - 4819 (2012/07/31)
More than green alternatives to traditional volatile molecular organic solvents, protic ionic liquids as dual solvent-catalysts have been successfully used to promote reactions of organoamines with oxadiazoles to afford sterically hindered 1,2,4-triazoles. Among the tested protic ionic liquids, pyridinium trifluoroacetate and acetate showed the highest efficiency for the reactions of arylamines and alkylamines, respectively, indicating that tunable catalysis could be readily effected with protic ionic liquid solvent-catalysts by simply tuning their cation and anion counterparts. A general and efficient approach has been developed for synthesis of multiply substituted 1,2,4-triazoles based on the tunable protic ionic liquid solvent-catalyst systems.
Method for producing haloalkanes from alcohols
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, (2008/06/13)
The invention relates to a process for preparing haloalkanes by reaction of alcohol with hydrogen halide, wherein the reaction of the alcohol with the hydrogen halide occurs in the presence of an ionic liquid at a temperature which is above 100° C. for at least part of the time and, at least at the time of the commencement of the reaction, the water content is not more than 25 mol % based on the amount of liquid, where the ionic liquid is not octyltrimethylammonium chloride.
METHOD FOR PRODUCING ONIUM SALTS COMPRISING ALKYL ANIONS OR ARYL SULFONATE ANIONS OR ALKYL ANIONS OR ARYL CARBOXYLATE ANIONS HAVING A LOW HALIDE CONTENT
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Page/Page column 33, (2008/06/13)
The invention relates to a method for producing onium salts comprising alkyl anions or aryl sulfonate anions or alkyl carboxylate anions or acryl carboxylate anions by reacting an onium halide with an alkyl silyl ester or trialkyl silyl ester of an alkyl sulfonic acid or aryl sulfonic acid or an alkyl carboxylic acid or aryl carboxylic acid or the anhydrides thereof.
Nucleophilic Substitution at the Tetracoordinated Sulfur. V. Reactivity of Amines and Azole Anions in Respect to Aryl 4-Tosylates in 80% Aqueous Dimethyl Sulfoxide
Savelova,Zubareva,Simanenko
, p. 1495 - 1500 (2007/10/03)
Acid dissociation constants of ammonium cations, imidazoles and phenols as well as the rates of aminolysis of p-toluenesulfonic esters 4-CH3C6H4SO2OC6H 4R in 80% aqueous DMSO at 25°C are measured. The angular coefficients of onsted plots in respect to attacking electrophiles and leaving group are close to those obtained earlier in protic media, indicating the similarity of the structure of transition states.
