Novel multiple-acidic ionic liquids: Green and efficient catalysts for the synthesis of bis-indolylmethanes under solvent-free conditions

2015 ◽  
Vol 24 ◽  
pp. 127-131 ◽  
Author(s):  
Anguo Ying ◽  
Zhifeng Li ◽  
Yuxiang Ni ◽  
Songlin Xu ◽  
Hailiang Hou ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Solvent Free ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids

One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones Catalyzed by Acidic Ionic Liquids Under Solvent-Free Conditions

2009 ◽  
Vol 39 (19) ◽  
pp. 3436-3443 ◽  
Author(s):  
Jianzhou Gui ◽  
Dan Liu ◽  
Chan Wang ◽  
Feng Lu ◽  
Jingzhao Lian ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Solvent Free ◽  
One Pot ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids

N,N,N′,N′-Tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate and pyridinium-N-sulfonic acid hydrogen sulfate as highly effective dual-functional catalysts for the preparation of N,N′-alkylidene bisamides

2019 ◽  
Vol 74 (9) ◽  
pp. 641-647 ◽  
Author(s):  
Zahra Kordrostami ◽  
Abdolkarim Zare ◽  
Mostafa Karami
Keyword(s):  
Ionic Liquids ◽  
Sulfonic Acid ◽  
Reaction Times ◽  
Solvent Free ◽  
Disulfonic Acid ◽  
Hydrogen Sulfate ◽  
Reaction Conditions ◽  
Dual Functional ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids

AbstractIn this research, Brønsted-acidic ionic liquids N,N,N′,N′-tetramethylethylene-diaminium-N,N′-disulfonic acid trifluoroacetate ([TMEDSA][TFA]2) and pyridinium-N-sulfonic acid hydrogen sulfate ([Py-SO3H][HSO4]) have been introduced as dual-functional catalysts for the green, simple and effective preparation of N,N′-alkylidene bisamides by the reaction of primary amides (2 eq.) with arylaldehydes (1 eq.) under solvent-free conditions. The reaction results and conditions of the catalysts have been compared with the previously reported ones. [TMEDSA][TFA]2 and [Py-SO3H][HSO4] were superior to the previously reported catalysts in terms of two or more of these factors: reaction times (10–45 min), yields (86–98%), temperature and the reaction conditions. Additionally, a plausible and attractive mechanism based on dual functionality of the catalysts has been proposed.

scholarly journals Long-chain Brønsted Acidic Ionic Liquids Catalyzed one-pot three-component Biginelli Reaction under Solvent-Free Conditions

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Leqin He
Keyword(s):  
Ionic Liquids ◽  
Biginelli Reaction ◽  
Aromatic Aldehydes ◽  
Catalytic Performance ◽  
Solvent Free ◽  
One Pot ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids ◽  
Halogen Free ◽  
Long Chain

A series of halogen-free quaternary ammonium Brønsted acidic ionic liquids (ILs) were prepared and used for Biginelli reaction among aromatic aldehydes, urea or thiourea and β-dicarbonyl compounds. The influencing factors, such as the type and amount of catalyst, solvent, reaction time and reaction temperature, were investigated. The results demonstrated that the 3-(N,N-dimethylhexadecylammonium) propanesulfonic acid toluene sulfate ([DHPA][Tos]) provide the best catalytic activity, with good catalytic performance and reusability under solvent-free conditions. A possible mechanism that accounted for the [DHPA][Tos]-catalyzed reaction was proposed.

Pechmann Reaction in Non-Chloroaluminate Acidic Ionic Liquids under Solvent-Free Conditions

2005 ◽  
Vol 347 (4) ◽  
pp. 512-516 ◽  
Author(s):  
Yanlong Gu ◽  
Juan Zhang ◽  
Zhiying Duan ◽  
Youquan Deng
Keyword(s):  
Ionic Liquids ◽  
Solvent Free ◽  
Pechmann Reaction ◽  
Solvent Free Conditions ◽  
Acidic Ionic Liquids
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