Studies on –SO<sub>3</sub>H functionalized Brønsted acidic imidazolium ionic liquids (ILs) for one-pot, two-step synthesis of 2-styrylquinolines
作者:Parishmita Sarma、Susmita Saikia、Ruli Borah
DOI:10.1080/00397911.2016.1193754
日期:2016.7.17
ABSTRACT Four task-specific –SO3H functionalized imidazolium ionicliquids (ILs) were investigated for Brønsted acidities by Hammett functions. After knowing their thermal stabilities, the catalytic activity was observed for the preparation of 2-styrylquinolines by following consecutive Friedländer and Knoevenagel reactions in solvent-free thermal energy. The acidity order ([Dsim][OOCCF3] > [Dsim][OTs]
Synthesis of dibenzoxanthene and acridine derivatives catalyzed by 1,3-disulfonic acid imidazolium carboxylate ionic liquids
作者:Arup Kumar Dutta、Pinky Gogoi、Ruli Borah
DOI:10.1039/c4ra07323a
日期:——
1,3-Disulfonic acid imidazolium carboxylate [DSIM][X] (where X = [CH3COO]−, [CCl3COO]−, [CF3COO]−) ILs were synthesized and their catalytic activity examined for the preparation of 14H-dibenzo[a,j]xanthene and 1,8-dioxo-decahydroacridine derivatives under solvent-free conditions and in water at 80–100 °C.
Preparation of various xanthene derivatives over sulfonic acid functionalized imidazolium salts (SAFIS) as novel, highly efficient and reusable catalysts
Abstract In this work, some novel sulfonicacidfunctionalized imidazolium salts (SAFIS), as a new category of ionicliquids, are synthesized by eco-friendly and simple procedures, and used as highly efficient and reusable catalysts to promote the following one-pot multicomponent organic transformations under solvent-free conditions: (i) the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes from β-naphthol
Synthesis, characterization and application of ionic liquid 1,3-disulfonic acid imidazolium hydrogen sulfate as an efficient catalyst for the preparation of hexahydroquinolines
作者:Abdolkarim Zare、Fereshteh Abi、Ahmad Reza Moosavi-Zare、Mohammad Hassan Beyzavi、Mohammad Ali Zolfigol
DOI:10.1016/j.molliq.2012.10.045
日期:2013.2
In this work, novel Brønsted acidic ionicliquid 1,3-disulfonic acid imidazoliumhydrogen sulfate [Dsim]HSO4} is synthesized, and characterized by studying its FT-IR, 1H NMR, 13C NMR, mass, TG, DTG and XRD spectra. This ionicliquid, with three acidic functional groups, is utilized as a highly efficient, homogeneous and reusable catalyst for the preparation of hexahydroquinolines via one-pot multi-component
在这项工作中,合成了新型的布朗斯台德酸性离子液体1,3-二磺酸咪唑硫酸氢盐[Dsim] HSO 4 },并通过对其FT-IR,1 H NMR,13 C NMR,质量,TG,DTG进行了表征和XRD光谱。这种具有三个酸性官能团的离子液体被用作高效,均质且可重复使用的催化剂,用于通过一锅多组分芳基醛,二甲酮(5,5-二甲基环己烷-1,3-二酮)的缩合反应制备六氢喹啉),β-酮酸酯和乙酸铵在无溶剂条件下使用。催化剂可以使用其SO 3 H基团形成双氢键,该主题可以指导其组装和效率。
Comparative study of the physical and electrochemical behavior of direct N-SO3H functionalized 1, 3-disulfo-2-alkyl-imidazolium trifluoroacetate ionic liquids in molecular solvents
作者:Sukanya Das、Trisha Dutta、Ruli Borah
DOI:10.1016/j.molliq.2019.111099
日期:2019.9
N-SO3H functionalized imidazolium [RSIM][CF3COO] ionic liquids, where R = H, CH3, C2H5 and n-C4H9 were synthesized and fully characterized with spectroscopic techniques. A detailed study on Brönsted acidity, thermal stability, conductivity, density and electrochemical window of the ionic liquids (ILs) was carried out to analyze the effects of the C-2 alkyl substituent of imidazolium cation. Increasing