Use of ionic liquids in cyclohexene epoxidation with hydrogen peroxide
摘要:
A comparative study of the reaction of catalytic epoxidation of cyclohexene with hydrogen peroxide in water and ionic liquids containing dihydrogen phosphate anions, such as trimethylammonium dihydrogen phosphate, diethylammonium dihydrogen phosphate, and N-methylpyrrolidonium dihydrogen phosphate has been performed. It has been shown that as high a cyclohexane epoxide yield as 80% with a selectivity close to quantitative can be obtained under optimum conditions by controlling the ratio of the ionic liquid components.
[Et<sub>3</sub>NH][HSO<sub>4</sub>]-catalyzed eco-friendly and expeditious synthesis of thiazolidine and oxazolidine derivatives
作者:Ali Mohammed Malla、Mehtab Parveen、Faheem Ahmad、Shaista Azaz、Mahboob Alam
DOI:10.1039/c4ra15590d
日期:——
reports a facile and green approach for the synthesis of thiazolidine/oxazolidine derivatives 4(a–u) in excellent yields (92–98%) with high purity. The protocol involves a one-pot three-componentreaction of substituted 1,3-diketones 1(a–g), cyanates 2(a–c) and ethylchloroacetate (3) in ionicliquid [Et3NH][HSO4] under solvent-free conditions. The notable feature of this pathway is that the ionic liquid
Quaternaryammoniumsalts were synthesized from ammoniumsalts and dialkyl carbonates over imidazolium ionic liquid catalysts. The reaction gave almost stoichiometric amounts of the quaternaryammoniumsalts for halides and nitrates. It was found that the electron-donating property of the alkyl moieties of ammonium cations, the electrophilic nature of the alkyl group of the carbonate, the acidity of
Use of ionic liquids in cyclohexene epoxidation with hydrogen peroxide
作者:E. A. Karakhanov、A. L. Maksimov、E. A. Runova、M. Yu. Talanova、T. Yu. Filippova、A. P. Glotov
DOI:10.1134/s096554411302014x
日期:2013.3
A comparative study of the reaction of catalytic epoxidation of cyclohexene with hydrogen peroxide in water and ionic liquids containing dihydrogen phosphate anions, such as trimethylammonium dihydrogen phosphate, diethylammonium dihydrogen phosphate, and N-methylpyrrolidonium dihydrogen phosphate has been performed. It has been shown that as high a cyclohexane epoxide yield as 80% with a selectivity close to quantitative can be obtained under optimum conditions by controlling the ratio of the ionic liquid components.