The Passerini three-component reaction of carboxylic acid, aromatic aldehyde and isocyanide was carried out smoothly and efficiently in ionic liquid [bmim]BF4. Through this reaction, a series of α-acyloxycarboxamides...The Passerini three-component reaction of carboxylic acid, aromatic aldehyde and isocyanide was carried out smoothly and efficiently in ionic liquid [bmim]BF4. Through this reaction, a series of α-acyloxycarboxamides were obtained in high yields. Advantages of this proccedure include a green nature, high efficiency and operational simplicity展开更多
A green microwave-assisted procedure for the preparation of a series of fifteen new N-alkylpyridazinium ionic liquids with different functionality in the alkyl chain is described. For the first time, target ionic liqu...A green microwave-assisted procedure for the preparation of a series of fifteen new N-alkylpyridazinium ionic liquids with different functionality in the alkyl chain is described. For the first time, target ionic liquids were prepared using standard methodology and under microwave irradiation in short duration of time with quantitative yields. In most cases, the microwave-assisted reaction is an environmentally friendly alternative to traditional methods.展开更多
Three diamine monomers with different derivatives of imidazole heterocyclic ring and meta-linked aryl ethers were synthesized and used in polycodensation reaction with various commercial dianhydrides for preparation o...Three diamine monomers with different derivatives of imidazole heterocyclic ring and meta-linked aryl ethers were synthesized and used in polycodensation reaction with various commercial dianhydrides for preparation of a series of novel poly（ether-imide） （PEI）s. The polycodensation reactions were carried out by using conventional method and in a green medium of ionic liquid （IL） without using NMP-pyridine-acetic anhydride. The PEIs were obtained in good yields （80%-96%） with moderate viscosity （0.48-0.66 dL/g） in a shorter reaction time （10 h） in IL as compared with the conventional method （36 h）. All of the polymers were amorphous in nature, showed excellent solubility in amide-type polar aprotic solvents with ability to form tough and flexible films, and excellent thermal stability with Tgs in the range of 212-340℃ and 10% weight loss temperature （T10） up to 570℃ in N2 and 528 ℃ in air.展开更多
Quantum chemical calculation was used to estimate the reduction potentials of 25 organic cations and the oxidation potentials of 11 anions.This information was used to select promising cations and anions for the prepa...Quantum chemical calculation was used to estimate the reduction potentials of 25 organic cations and the oxidation potentials of 11 anions.This information was used to select promising cations and anions for the preparation of ionic liquids as green electrolytes for electrodeposition of active metals.The reasonable linear correlations between the lowest unoccupied molecular orbital(LUMO)energies and the reduction potentials of cations,and the linear relationships between the oxidation potentials and the highest occupied molecular orbital(HOMO)energies of anions were obtained.The orders of electrochemical stability for cations and anions being obtained agree well with the experimental measurements.The suitable ionic liquids with sufficiently wide electrochemical windows for electrodeposition of active metals are suggested to be[Emim]NTf2,[Bmim]NTf2,[Bmim]BF4, [Bmim]PF6,[Bmim]CTf3,[Emim]BF4,[Emim]PF6,[Emim]CTf3..展开更多
An efficient and green method for the synthesis of 1, 4-dihydropyridine derivatives mediated in an ionic liquid, [bmim][BF4], through a four-component condensation process of aldehydes, 1, 3-dione, Meldrum＇s acid and...An efficient and green method for the synthesis of 1, 4-dihydropyridine derivatives mediated in an ionic liquid, [bmim][BF4], through a four-component condensation process of aldehydes, 1, 3-dione, Meldrum＇s acid and ammonium acetate is disclosed in this paper.展开更多
Novel Lewis acidic ionic liquids containing thionyl cations and chloroaluminate anions were obtained by one-pot synthesis for the first time. Their acidities were determined by acetonitrile probe on IR spectrography. ...Novel Lewis acidic ionic liquids containing thionyl cations and chloroaluminate anions were obtained by one-pot synthesis for the first time. Their acidities were determined by acetonitrile probe on IR spectrography. The ionic liquids were used as catalyst for Friedel-Crafts alkylation of benzene and 1-dodecene. The turnovers of l-dodecene were higher than 99%. Monoalkylbenzene selectivity was 98%, while the 2-substituent product selectivity was 45%.展开更多
Dipyrromethanes were obtained in moderate yields by the condensation of ketone and pyrrole in the presence of ionic liquid [Hmim]BF4 without using any strong acid and other organic solvent.
Functional crown-ether ionic liquids were used as catalytic green solvents of Finkelstein reaction of 1-bromooctane and iodide. The rate and yield of the reaction were obvious improved compared with that using crown e...Functional crown-ether ionic liquids were used as catalytic green solvents of Finkelstein reaction of 1-bromooctane and iodide. The rate and yield of the reaction were obvious improved compared with that using crown ether in water. No free crown ether loss was observed after reaction.展开更多
In literature concerning ionic liquid (IL) applications, the commonly accepted properties of ionic liquids are frequently mentioned. For example, ionic liquids are described as possessing immeasurably low vapor pressu...In literature concerning ionic liquid (IL) applications, the commonly accepted properties of ionic liquids are frequently mentioned. For example, ionic liquids are described as possessing immeasurably low vapor pressure, being “green material”, non-coordinating, physically and chemically stable, and non-toxic, to name a few. However, all these descriptions are deemed “not exact” [1] as intensive research on ionic liquid properties continues. This review highlights the most recent developments in IL chemistry where the “well-known” description of IL properties sometimes proves to be inaccurate. However, in the authors’ opinion, all these new research developments concerning ionic liquid properties serve to update knowledge on the typical physical and chemical properties of ILs, which is significant to both theoretical research and industrial applications. This review presents an opportunity to understand IL through a more complete and accurate view. It seeks to pave the way for further studies on IL application in various fields.展开更多
12-Aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-one derivatives were synthesized by a convenient and environmentally benign procedure involving multicomponent condensation reactions of substituted aromatic aldehydes w...12-Aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-one derivatives were synthesized by a convenient and environmentally benign procedure involving multicomponent condensation reactions of substituted aromatic aldehydes with 2,7-dihydroxynaphthalene/2-naphthols/2,6-dihydroxynaphthlene and cyclic 1,3-dicarbonyl compounds in task specific acidic ionic liquid[NMP]HPOat 80 ℃.This protocol has proved to be efficient in terms of good yields,operational simplicity,easy workup,recyclability of reaction medium/catalyst,and short reaction time.展开更多
Caffeine was applied as a green and natural catalyst for the one-pot,four-component sequential condensation between 2-hydroxy-1,4-naphthoquinone,aromatic 1,2-diamines,ammonium thiocyanate and acid chlorides in the pre...Caffeine was applied as a green and natural catalyst for the one-pot,four-component sequential condensation between 2-hydroxy-1,4-naphthoquinone,aromatic 1,2-diamines,ammonium thiocyanate and acid chlorides in the presence of a basic ionic liquid（l-butyl-3-methylimidazolium hydroxide） to afford the corresponding benzo[a][1,3]oxazino[6,5-c]phenazine derivatives.In this one-pot transformation,five bonds and two new rings are efficiently formed.This protocol has the advantages of operational simplicity,high yields,easy workup,avoidance of hazardous or toxic catalysts and organic solvents and high chemo-and regioselectivities.展开更多
文摘The Passerini three-component reaction of carboxylic acid, aromatic aldehyde and isocyanide was carried out smoothly and efficiently in ionic liquid [bmim]BF4. Through this reaction, a series of α-acyloxycarboxamides were obtained in high yields. Advantages of this proccedure include a green nature, high efficiency and operational simplicity
文摘A green microwave-assisted procedure for the preparation of a series of fifteen new N-alkylpyridazinium ionic liquids with different functionality in the alkyl chain is described. For the first time, target ionic liquids were prepared using standard methodology and under microwave irradiation in short duration of time with quantitative yields. In most cases, the microwave-assisted reaction is an environmentally friendly alternative to traditional methods.
文摘Three diamine monomers with different derivatives of imidazole heterocyclic ring and meta-linked aryl ethers were synthesized and used in polycodensation reaction with various commercial dianhydrides for preparation of a series of novel poly（ether-imide） （PEI）s. The polycodensation reactions were carried out by using conventional method and in a green medium of ionic liquid （IL） without using NMP-pyridine-acetic anhydride. The PEIs were obtained in good yields （80%-96%） with moderate viscosity （0.48-0.66 dL/g） in a shorter reaction time （10 h） in IL as compared with the conventional method （36 h）. All of the polymers were amorphous in nature, showed excellent solubility in amide-type polar aprotic solvents with ability to form tough and flexible films, and excellent thermal stability with Tgs in the range of 212-340℃ and 10% weight loss temperature （T10） up to 570℃ in N2 and 528 ℃ in air.
基金Projects(50564006,50904031)supported by the National Natural Science Foundation of ChinaProjects(2005E0004Z,2008E0049M)supported by the Natural Science Foundation of Yunnan Province,China+1 种基金Project(07Z40082)supported by the Science Foundation of the Education Department of Yunnan Province,ChinaProject(2007-16)supported by the Science Foundation of Kunming University of Science and Technology,China
文摘Quantum chemical calculation was used to estimate the reduction potentials of 25 organic cations and the oxidation potentials of 11 anions.This information was used to select promising cations and anions for the preparation of ionic liquids as green electrolytes for electrodeposition of active metals.The reasonable linear correlations between the lowest unoccupied molecular orbital(LUMO)energies and the reduction potentials of cations,and the linear relationships between the oxidation potentials and the highest occupied molecular orbital(HOMO)energies of anions were obtained.The orders of electrochemical stability for cations and anions being obtained agree well with the experimental measurements.The suitable ionic liquids with sufficiently wide electrochemical windows for electrodeposition of active metals are suggested to be[Emim]NTf2,[Bmim]NTf2,[Bmim]BF4, [Bmim]PF6,[Bmim]CTf3,[Emim]BF4,[Emim]PF6,[Emim]CTf3..
文摘An efficient and green method for the synthesis of 1, 4-dihydropyridine derivatives mediated in an ionic liquid, [bmim][BF4], through a four-component condensation process of aldehydes, 1, 3-dione, Meldrum＇s acid and ammonium acetate is disclosed in this paper.
基金Supported by the National Natural Science Foundation of China (No. 20273019) and the ScienceFoundation of Henan Normal University for Young Scholars (No. 0307032).
基金the grant from the National Natural Science Foundation of China （Key Program 20533010）.
文摘Novel Lewis acidic ionic liquids containing thionyl cations and chloroaluminate anions were obtained by one-pot synthesis for the first time. Their acidities were determined by acetonitrile probe on IR spectrography. The ionic liquids were used as catalyst for Friedel-Crafts alkylation of benzene and 1-dodecene. The turnovers of l-dodecene were higher than 99%. Monoalkylbenzene selectivity was 98%, while the 2-substituent product selectivity was 45%.
文摘Dipyrromethanes were obtained in moderate yields by the condensation of ketone and pyrrole in the presence of ionic liquid [Hmim]BF4 without using any strong acid and other organic solvent.
基金the Key Program of the National Natural Science Foundation of China(No.20533010).
文摘Functional crown-ether ionic liquids were used as catalytic green solvents of Finkelstein reaction of 1-bromooctane and iodide. The rate and yield of the reaction were obvious improved compared with that using crown ether in water. No free crown ether loss was observed after reaction.
文摘In literature concerning ionic liquid (IL) applications, the commonly accepted properties of ionic liquids are frequently mentioned. For example, ionic liquids are described as possessing immeasurably low vapor pressure, being “green material”, non-coordinating, physically and chemically stable, and non-toxic, to name a few. However, all these descriptions are deemed “not exact” [1] as intensive research on ionic liquid properties continues. This review highlights the most recent developments in IL chemistry where the “well-known” description of IL properties sometimes proves to be inaccurate. However, in the authors’ opinion, all these new research developments concerning ionic liquid properties serve to update knowledge on the typical physical and chemical properties of ILs, which is significant to both theoretical research and industrial applications. This review presents an opportunity to understand IL through a more complete and accurate view. It seeks to pave the way for further studies on IL application in various fields.
基金UGC,New Delhi,India for the grant of Junior and Senior Research FellowshipUGC,New Delhi,India for the grant of Junior Research Fellowship
文摘12-Aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-one derivatives were synthesized by a convenient and environmentally benign procedure involving multicomponent condensation reactions of substituted aromatic aldehydes with 2,7-dihydroxynaphthalene/2-naphthols/2,6-dihydroxynaphthlene and cyclic 1,3-dicarbonyl compounds in task specific acidic ionic liquid[NMP]HPOat 80 ℃.This protocol has proved to be efficient in terms of good yields,operational simplicity,easy workup,recyclability of reaction medium/catalyst,and short reaction time.
基金financial support from the Research Council of Young Researchers and Elite Club,Yazd Branch,Islamic Azad University,Yazd,Iran and University of Science and Arts of Yazd,Iran
文摘Caffeine was applied as a green and natural catalyst for the one-pot,four-component sequential condensation between 2-hydroxy-1,4-naphthoquinone,aromatic 1,2-diamines,ammonium thiocyanate and acid chlorides in the presence of a basic ionic liquid（l-butyl-3-methylimidazolium hydroxide） to afford the corresponding benzo[a][1,3]oxazino[6,5-c]phenazine derivatives.In this one-pot transformation,five bonds and two new rings are efficiently formed.This protocol has the advantages of operational simplicity,high yields,easy workup,avoidance of hazardous or toxic catalysts and organic solvents and high chemo-and regioselectivities.
