Activity and behavior of imidazolium salts as a phase transfer catalyst for a liquid–liquid phase system

Abstract

The structure-activity relationship and behavior of N,N-dialkylimidazolium salts as a phase transfer and/or ion exchange catalyst in a liquid-liquid phase system was investigated for various reactions.Leave this area blank for abstract info.

Oxidative Desulfurization of Azole‐2‐thiones with Benzoyl Peroxide: Syntheses of Ionic Liquids and Other Azolium Salts

“…Comparison of the integral of the [C 4 mim] methyl proton resonance to the integral of theneatly resolved dimethyl sulfoxide singlet was used to solve for millimol [C 4 mim] species per gram of filtrate. Note all three protons of a dialkylimidazolium ring can exchange with deuterium oxide (although the process requires supplied base65,66 or a palladium catalyst67 to be synthetically useful). After determination of [C 4 mim] concentration with NMR, a stoichiometric amount of sodium benzoate was added to the remaining solution, precipitating a second crop of sodium salts (Scheme , A = OBz).…”

1,1'-Bis-Methyl-3, 3-Methylenebisimidazolium Dichloride as an Efficient Phase Transfer Catalyst for Ring Opening of Epoxides Using SCN- and N3- in water

“…Recently, ILs have assumed this aspect as a phase transfer or anion exchange catalyst. [8][9][10] In continuing our efforts to develop and introduce new phase transfer catalyst for organic transformation, [11][12][13][14] we describe here the application of 1,1′-bis-methyl-3,3′-methylene-bisimidazolium dichloride as a PTC for ring opening of epoxides in aqueous media.…”

Ionic liquids as phase transfer catalysts: Enhancing the biphasic extractive epoxidation reaction for the selective synthesis of β-O-glycosides

“…Molecules with amphiphilic structures are often used in organic synthesis to facilitate reactions between organic reactants and ionic inorganic salts, recently some IL's were tested as PTC. [7][8][9][10] In the last years, there has been sustained interest in the selective synthesis of b-glycosides. The synthesis of 1,2-anhydrosugars and the subsequent nucleophilic ring opening reaction is a promising methodology to achieve this desired carbohydrate derivatives.…”