ChemInform Abstract: Lipase-Catalyzed Reactions in Ionic Liquids.

ChemInform ◽  
2001 ◽  
Vol 32 (12) ◽  
pp. no-no
Author(s):  
R. Madeira Lau ◽  
F. van Rantwijk ◽  
K. R. Seddon ◽  
R. A. Sheldon
Keyword(s):  
Ionic Liquids ◽  
Catalyzed Reactions

Ionic Liquid Promoted Eco-friendly and Efficient Synthesis of Six-membered Npolyheterocycles

2018 ◽  
Vol 15 (8) ◽  
pp. 1124-1146 ◽  
Author(s):  
Navjeet Kaur
Keyword(s):  
Organic Chemistry ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Organic Solvents ◽  
Review Article ◽  
Environmentally Benign ◽  
Wide Range ◽  
Catalyzed Reactions ◽  
Metal Catalyzed ◽  
Reaction Media

Background: The synthesis of N-polyheterocycles by environmentally benign method is highly attractive but challenging proposition. New strategies have been developed for the preparation of polycyclic heterocycles in the last decades. In this review article, the synthesis of nitrogen containing six-membered polycyclic heterocyclic compounds is presented with the application of ionic liquids. This contribution focuses on the literature related to the total synthesis of six-membered N-polyheterocycles. Objective: Ionic liquids not only acted as environmentally benign reaction media but also as catalysts which afforded the very promising replacements of traditional molecular solvents in organic chemistry due to their stability, non-flammability, non-volatility and ease of recyclability. Ionic liquids are utilized in metal catalyzed reactions in place of organic solvents in the last years. It has attracted considerable attention in recent years. Ionic liquids acted as alternatives of organic solvents and these ILs are environment friendly. Conclusion: In the area of green chemistry ionic liquid assisted synthesis is a very promising technique which afforded a flexible platform for the formation of heterocycles. The influence of ILs on the development of efficient and new synthetic protocols over the last decade for the construction of N-polyheterocycles is featured in this review article. These synthetic strategies will continue to attract more attention and will find a wide range of applications in organic synthesis. In conclusion, ionic liquids assisted syntheses have become an efficient and powerful tool in organic chemistry quickly.

ChemInform Abstract: Ionic Liquids - A Versatile Medium for Palladium-Catalyzed Reactions

ChemInform ◽  
2009 ◽  
Vol 40 (2) ◽  
Author(s):  
Ram Singh ◽  
Mukul Sharma ◽  
Ritu Mamgain ◽  
Diwan S. Rawat
Keyword(s):  
Ionic Liquids ◽  
Palladium Catalyzed ◽  
Catalyzed Reactions

scholarly journals Ionic liquids: a versatile medium for palladium-catalyzed reactions

2008 ◽  
Vol 19 (3) ◽  
pp. 357-379 ◽  
Author(s):  
Ram Singh ◽  
Mukul Sharma ◽  
Ritu Mamgain ◽  
Diwan S. Rawat
Keyword(s):  
Ionic Liquids ◽  
Palladium Catalyzed ◽  
Catalyzed Reactions

Vanadium-catalyzed, microwave-assisted oxidations with H2O2 in ionic liquids

2009 ◽  
Vol 81 (7) ◽  
pp. 1265-1277 ◽  
Author(s):  
Valeria Conte ◽  
Francesca Fabbianesi ◽  
Barbara Floris ◽  
Pierluca Galloni ◽  
Daniela Sordi ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Functional Groups ◽  
Efficient Procedure ◽  
Microwave Assisted ◽  
Study Results ◽  
Rate Of Reaction ◽  
Vanadium Based Catalysts ◽  
Catalyzed Reactions ◽  
Metal Catalyzed ◽  
Epoxidation Of Alkenes

The application of vanadium(V) catalysts in selective oxidation with peroxides offers an efficient procedure that is compatible with different functional groups and leads to good yields and selectivities. However, the search for more efficient and sustainable procedures that employ H2O2 as oxidant remains an important topic. In the last few years, striking results have been obtained by applying microwave (MW) activation in metal-catalyzed reactions carried out in ionic liquids (ILs). In the present study, results achieved with vanadium-based catalysts in oxidations of various substrates with H2O2 are presented; in particular, epoxidation of alkenes and sulfoxidation of thioethers have been investigated. Notably, in the latter oxidation, a significant improvement in the rate of reaction and an increase in selectivity have been observed in the case of hydrophobic ILs in combination with MW activation.

Palladium-Catalyzed Reactions in Ionic Liquids

ChemInform ◽  
2004 ◽  
Vol 35 (31) ◽  
Author(s):  
Tom Welton ◽  
Paul J. Smith
Keyword(s):  
Ionic Liquids ◽  
Palladium Catalyzed ◽  
Catalyzed Reactions

scholarly journals Ionic liquids as (co)solvents for enzymatic reactions

2006 ◽  
Vol 12 (3) ◽  
pp. 181-186 ◽  
Author(s):  
Muzafera Paljevac ◽  
Maja Habulin ◽  
Zeljko Knez
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Immobilized Lipase ◽  
Rhizomucor Miehei ◽  
Reaction Rates ◽  
Synthetic Activity ◽  
Enzymatic Reactions ◽  
Lipozyme Rm Im ◽  
Catalyzed Reactions ◽  
Enzyme Catalyzed Reactions

Ionic liquids are low melting point salts that represent an exciting new class of reaction solvents. Many reactions show advantages when carried out in ionic liquids, either with regard to enhanced reaction rates, improved selectivity, or easier reuse of catalysts. To ascertain the influence of ionic liquids on the enzyme activity, three different ionic liquids 1-butyl-3-methylimidazolium chloride ([bmim] [CI]) 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim] [PF6]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) were synthesized and investigated as potential media for the hydrolysis of carboxymethyl cellulose, catalyzed by non-immobilized cellulase from Humicola insolens (Celluzyme 0,7T) and for ester synthesis, catalyzed by immobilized lipase from Rhizomucor miehei (Lipozyme RM IM). Enzyme-catalyzed reactions were performed in a batch stirred reactor at atmospheric pressure. Celluzyme 0,7T showed better activity in hydrophobic ionic liquid ([bmim] [PF6]), as compared to hydrophilic ionic liquid ([bmim] [BF4]). In the case of Lipozyme RM IM, the synthetic activity of the enzyme was strongly reduced by incubating the enzyme in ionic liquids.

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