The impressive chemistry, applications and features of ionic liquids: properties, catalysis & catalysts and trends

Abstract

Algumas das nossas contribuições para o desenvolvimento da área da catálise em líquidos iônicos são descritas. Além disto, o uso de ligantes ionofílicos bem como a utilização de catalisadores com "etiquetas iônicas" são apresentados e discutidos. Devido à importância dos líquidos iônicos, as suas propriedades fisicoquímicas de interesse bem como a sua organização supramolecular são temas discutidos.Some of our contributions to the development of catalysis in ionic liquids are described. Also, the use of ionophilic ligands and catalysts with ionic tags are presented and discussed. Due to the importance of ionic liquids, some physicochemical properties of interest and their supramolecular organization are described.

A surfactant-like ionic liquid with permanganate dissolved as a highly selective epoxidation system

“…KMnO 4 , 98% conversion was achieved; it gave 91% heptanoic acid while epoxide was only 2%. The experimental results indicate that the IL medium takes effects and gives better product selectivity than those conducted in organic solvents for epoxidation because the strong oxidizing characteristic of permanganate becomes controllable in IL, which is in accord with the literature findings that the ionic medium is able to stabilize the key intermediate species [30,31]. However, to prevent epoxides being over-oxidized, a catalytic amount of KMnO 4 in IL is suitable to achieve excellent selectivity (N 90%) and good yield for epoxides.…”

A New Approach to CO2Capture and Conversion Using Imidazolium Based-Ionic Liquids as Sorbent and Catalyst

“…It was observed that the reaction time reduction from 6 up to 2 h (entry [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], provided a decreases in yield, curiously the increase in reaction time from 6 to 8 h (entry 4-21) decreases the yield. The reaction time of 6 h was ideal for this the system.…”

“…They are more environmentally friendly when compared to conventional organic solvents exhibiting the possibility of the catalyst separation and recycling. 6,[13][14][15][16] Peng and Deng 10 reported the synthesis of propylene carbonate from CO 2 6 ] and demonstrated that the catalytic activity of an ionic liquid depends on the nature of the cation and the anion. For the anions, the activity decreased in the order bmim + > bpy + and BF 4 − > Cl − > PF 6 − .…”

Efficient catalytic oxidation of methyl aromatic hydrocarbon with N-alkyl pyridinium salts

“…Different N-alkyl pyridinium salts were synthesized by reuxing corresponding pyridines with alkyl bromide in a procedure refereeing to the previously published report. 36,38 The synthesis was carried out under the following procedure: 1 mol of pyridine and 80 ml of toluene were placed in the ask, respectively. 1.1 mol of alkyl bromide were added dropwise into the ask at 70 C and reuxed for 24 hours.…”