Selective Oxidation of Thioureas in an Ionic Liquid by Employing an Ion-supported Hypervalent Iodine(III) Reagent

2005 ◽  
Vol 2005 (9) ◽  
pp. 613-616 ◽  
Author(s):  
Weixing Qian ◽  
Erlei Jin ◽  
Weiliang Bao ◽  
Yongmin Zhang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Selective Oxidation ◽  
Good Yield ◽  
Hypervalent Iodine ◽  
Mild Conditions

Several 2,4-dialkyl-3,5-bis(arylimino)-1,2,4-thiadiazolidines were synthesised under mild conditions in good yield by the selective oxidation of N-alkyl-N'-arylthioureas by using 1-(4-diacetoxyiodobenzyl)-3-methyl imidazolium tetrafluoroborate [dibmim]+[BF4]- in ionic liquids.

Eco-friendly acetylcholine-carboxylate bio-ionic liquids for controllable N-methylation and N-formylation using ambient CO2 at low temperatures

2019 ◽  
Vol 21 (3) ◽  
pp. 567-577 ◽  
Author(s):  
Wenfeng Zhao ◽  
Xiaoping Chi ◽  
Hu Li ◽  
Jian He ◽  
Jingxuan Long ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Catalytic System ◽  
Low Temperatures ◽  
Mild Conditions ◽  
Ambient Co2

A sustainable and recyclable ionic liquid catalytic system is developed to be efficient in N-methylation or N-formylation of amines with CO2 under mild conditions.

Ionic Liquid [Bmim]OH Grafted Catalyst for Cycloaddition of Carbon Dioxide

2014 ◽  
Vol 989-994 ◽  
pp. 676-679 ◽  
Author(s):  
Xue Lan Zhang ◽  
Deng Feng Wang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
Element Analysis ◽  
Mild Conditions ◽  
Adsorption Desorption

An ionic liquid 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH) was grafted on silica gel by post-grafting method. Such grafted ionic liquids (GILs) which were verified by means of FTIR, element analysis N2adsorption-desorption and TG could be used as highly effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of carbon dioxide with propylene oxide under solventless and mild conditions.

Preparation and Activity of Ionic Liquid Catalysts Grafted on Hydrophobic Silica Gel

2012 ◽  
Vol 476-478 ◽  
pp. 2621-2624
Author(s):  
Xue Lan Zhang ◽  
Deng Feng Wang
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Silica Gel ◽  
Propylene Oxide ◽  
Heterogeneous Catalysts ◽  
N2 Adsorption ◽  
Mild Conditions ◽  
Hydrophobic Silica ◽  
Adsorption Desorption

An ionic liquid 1- (triethoxysilyl) propyl-3-methylimidazolium hydroxide ([Smim]OH) was grafted on three kinds of mesoporous hydrophobic silica gel by means of post-grafting under mild conditions. The catalysts were [Smim]OH/SiO2-MTES (methyltriethoxysilane), [Smim]OH/SiO2-TMCS (trimethylchlorosilane), [Smim]OH/SiO2-CPTEO (triethoxysilyl propyl chloride). Such grafted ionic liquids (GILs), which were characterized by means of FTIR and N2 adsorption-desorption could be used as effective heterogeneous catalysts toward propylene carbonate synthesis through cycloaddition of carbon dioxide with propylene oxide under solventless and mild conditions.

scholarly journals Efficient and Reusable Iron Catalyst to Convert CO2 into Valuable Cyclic Carbonates

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1089
Author(s):  
Ana P. C. Ribeiro ◽  
Peter Goodrich ◽  
Luísa M. D. R. S. Martins
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Catalytic Effect ◽  
Iron Catalyst ◽  
Cyclic Carbonate ◽  
Cyclic Carbonates ◽  
Mild Conditions ◽  
First Time

The production of cyclic carbonates from CO2 cycloaddition to epoxides, using the C-scorpionate iron(II) complex [FeCl2{κ3-HC(pz)3}] (pz = 1H-pyrazol-1-yl) as a catalyst, is achieved in excellent yields (up to 98%) in a tailor-made ionic liquid (IL) medium under mild conditions (80 °C; 1–8 bar). A favorable synergistic catalytic effect was found in the [FeCl2{κ3-HC(pz)3}]/IL system. Notably, in addition to exhibiting remarkable activity, the catalyst is stable during ten consecutive cycles, the first decrease (11%) on the cyclic carbonate yield being observed during the 11th cycle. The use of C-scorpionate complexes in ionic liquids to afford cyclic carbonates is presented herein for the first time.

scholarly journals Palladium-catalyzed Sonogashira coupling reactions in γ-valerolactone-based ionic liquids

2019 ◽  
Vol 15 ◽  
pp. 2907-2913 ◽  
Author(s):  
László Orha ◽  
József M Tukacs ◽  
László Kollár ◽  
László T Mika
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Reaction Medium ◽  
Cross Coupling ◽  
Environmental Efficiency ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Mild Conditions ◽  
Palladium Catalyzed ◽  
Alternative Reaction Medium

It was demonstrated that the γ-valerolactone-based ionic liquid, tetrabutylphosphonium 4-ethoxyvalerate as a partially bio-based solvent can be utilized as alternative reaction medium for copper- and auxiliary base-free Pd-catalyzed Sonogashira coupling reactions of aryl iodides and functionalized acetylenes under mild conditions. Twenty-two cross-coupling products were isolated with good to excellent yields (72–99%) and purity (>98%). These results represent an example which proves that biomass-derived safer solvents can be utilized efficiently in common, industrially important transformations exhibiting higher chemical and environmental efficiency.

Green Synthesis of Liquid Crystal Intermediates the Preparation of Phenylacetylenes in Ionic Liquids

2010 ◽  
Vol 428-429 ◽  
pp. 46-51
Author(s):  
Bao You Liu ◽  
Hui Long Yang ◽  
Yi Ping Wang ◽  
Yuan Yuan Wang ◽  
Zhi Jie Wu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Crystal ◽  
Green Synthesis ◽  
Sonogashira Coupling ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Substituted Acetylenes

Sonogashira coupling of phenylacetylenes with phenyl iodides in 1-butyl-3-methyl- imidazolium bromide (BMImBr) was explored. Using CuI/Pd(PPh3)4 as a catalyst and Im as the base, the expected substituted acetylenes were obtained with good to excellent yields (61%-95%) under mild conditions (4h, 60oC). After the product was isolated, the left ionic liquid can been readily recovered and reused in the subsquent runs with almost the same efficiency. The reactivity of different iodoarenes with terminal alkynes was also discussed.

Selective Oxidation of Thioureas in an Ionic Liquid by Employing an Ion-Supported Hypervalent Iodine(III) Reagent.

ChemInform ◽  
2006 ◽  
Vol 37 (4) ◽  
Author(s):  
Weixing Qian ◽  
Erlei Jin ◽  
Weiliang Bao ◽  
Yongmin Zhang
Keyword(s):  
Ionic Liquid ◽  
Selective Oxidation ◽  
Hypervalent Iodine

An Efficient and Ecofriendly Three-Component Reaction for the Rapid Synthesis of 2-Amino-4H-chromenes Catalyzed by a DABCO­-Based Ionic Liquid

Synthesis ◽  
2018 ◽  
Vol 50 (18) ◽  
pp. 3708-3714 ◽  
Author(s):  
Da-Zhen Xu ◽  
Cheng-Bin Li ◽  
Yu-Wei Li
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Michael Reaction ◽  
Reaction Times ◽  
Rapid Synthesis ◽  
Biologically Relevant ◽  
Mild Conditions ◽  
Three Component Reaction ◽  
Green Strategy

An efficient, economical, and green strategy for the construction of biologically relevant 2-amino-4H-chromene scaffolds via a tandem Knoevenagel–Pinner cyclization–Michael reaction has been successfully developed. In the presence of DABCO-based ionic liquids, two different 2-amino-4H-chromene derivatives, 2-amino-4-(indol-3-yl)-4H-chromenes and 2-amino-4-(pyrazol-4-yl)-4H-chromenes, were prepared in good to excellent yields (81–97%) within short reaction times under mild conditions. All the products are purified by simple crystallization. The catalyst could be recycled for at least five times.

Regioselective alkylation of 1,2,4-triazole using ionic liquids under microwave conditions

2016 ◽  
Vol 5 (3) ◽  
Author(s):  
Ramandeep Kaur ◽  
Bhupinder Kumar ◽  
Ashish Ranjan Dwivedi ◽  
Vinod Kumar
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Potassium Carbonate ◽  
Triazole Derivatives ◽  
Mild Conditions ◽  
Excellent Yield ◽  
Regioselective Alkylation ◽  
Anti Inflammatory

Abstract1-Substituted 1,2,4-triazole derivatives present in a large number of compounds and display a variety of bioactivities such as antibiotic, anti-inflammatory, anti-diabetic, antipsychotic, and anticancer. A regioselective protocol has been developed for the alkylation of 1,2,4- triazole using mild conditions. The 1-alkyl-1,2,4-triazole derivatives were synthesized under microwave conditions using potassium carbonate as a base and ionic liquid (hexylpyridinium bromide) as a solvent. The products were obtained in excellent yield, and the base-ionic liquid combination was recycled for a number of times.

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