Synthesis, characterization and application of ionic liquid 1,3-disulfonic acid imidazolium hydrogen sulfate as an efficient catalyst for the preparation of hexahydroquinolines

Imidazolium Ionic Liquids: An Environment-Friendly Medium for Various Applications

“…The Rahman M et al approach (2014): In the Biginelli reaction, IL [1-methyl-3-(4-sulfobutyl)imidazolium-4-methylbenzenesulfonate] was used in catalytic amount for the synthesis of benzoquinazolin-2-one derivatives using α-tetralone, aldehyde, and urea/thiourea (Scheme 7.17) in excellent yields within a short reaction time [121]. [123]. The Kalkhambkar R G et al approach (2012): The synthesis of 2-aryl-and 2-heteroaryl-benzoxazoles and benzothiazoles from Schiff bases by using catalytic amounts of Pd(OAc) 2 in imidazolium ILs (bmim)BF 4 and (bmim)PF 6 without ligands and/or additives has been reported (Scheme 7.22) [126].…”

Design and characterization of nano-silica-bonded 3-n-propyl-1-sulfonic acid imidazolium chloride {nano-SB-[PSIM]Cl} as a novel, heterogeneous and reusable catalyst for the condensation of arylaldehydes with β-naphthol and alkyl carbamates

“…They have various distinct properties such as non-volatility, a wide liquid-state temperature range, nonflammability, very low vapor pressures, reasonable thermal and chemical stability, excellent ionic conductivities, electrochemical stability, a large electrochemical window, recyclability as well as reusability, eco-friendly, tunable hydrophobicity, and favorable solvation behavior [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Because of their operational efficacy and selectivity along with their green nature, among different types of ILs, Brønsted acidic ones have shown the potential for ,, progress of environmental friendly acidcatalyzed organic reactions [5][6][7][8][9][10][11][12][13][14]. On the other hand, lately, heterogenization of ILs by decorating them on solid supports has grasped an ever increasing attention.…”

“…Recently, we introduced sulfonic acid-functionalized imidazolium salts (SAFIS) and quaternary ammonium salts as a new type of Brønsted acidic ILs [9][10][11][12][13][14]. In these materials, SO 3 H functional groups have been bonded to positive nitrogens (N ? )…”

“…for the first time. We applied them as highly efficient and homogeneous catalysts for different organic transformations [9][10][11][12][13][14]. Although these ILs efficiently catalyzed several organic reactions, recycling and reusing the ILs were difficult.…”

Degradação Oxidativa De Líquidos Iônicos Baseados Em Imidazolio Utilizando Processos Fenton, Foto-Fenton E Foto-Fenton Solar

“…Esta composição pode ser manipulada, possibilitando a obtenção de 10 6 diferentes LI, de modo a se obter valores desejáveis para propriedades como hidrofobicidade, polaridade e comportamento de miscibilidade do solvente; portanto os LI são denominados de design solvents (SIEDLECKA et al, 2008). Recentemente, líquidos iônicos (LI's) têm atraído um interesse considerável por causa de seu potencial industrial e aplicações diversificadas, com base em suas diferentes propriedades ajustáveis (PHAM et al, 2010;SIEDLECKA et al, 2012;ZARE et al, 2013). Estas propriedades torna-os como uma alternativa ideal para substituir os solventes orgânicos tóxicos convencionais e volátil (ROGERS e SEDDON, 2002).…”