Hydrogen bonding-catalysed alcoholysis of propylene oxide at room temperature

2021 ◽  
Author(s):  
Yueting Xu ◽  
Yanfei Zhao ◽  
Fengtao Zhang ◽  
Yuepeng Wang ◽  
Ruipeng Li ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Propylene Oxide ◽  
Room Temperature ◽  
Glycol Ethers ◽  
High Yields

Alcoholysis of propylene oxide is achieved over azolate ionic liquids at room temperature by hydrogen-bonding catalysis, accessing glycol ethers in moderate to high yields with selectivity of >99%.

scholarly journals Carbonyl Sulfide-Mediated Synthesis of Peptides with Amino Acid Ionic Liquids

2019 ◽  
Author(s):  
Ming Chen ◽  
Xihan Yu
Keyword(s):  
Ionic Liquids ◽  
Amino Acid ◽  
Room Temperature ◽  
Solid Phase ◽  
Solid Phase Peptide Synthesis ◽  
Carbonyl Sulfide ◽  
Coupling Reactions ◽  
Volcanic Emission ◽  
High Yields ◽  
Primordial Earth

Carbonyl sulfide (OCS), the component of volcanic emission, has been found to induce the condensation of amino acids under simulated primordial earth conditions. However, the applications of OCS in peptide chemical synthesis is still limited by their heterogeneities and low efficiencies. We herein report an OCS-mediated approach for solid-phase peptide synthesis using amino acid ionic liquids as recyclable reactants. The coupling reactions required no base and solvent and was completed in minutes at room temperature. The applicability and sustainability of this approach were demonstrated by the facile syntheses of peptides with remarkably high yields.

scholarly journals The role of hydrogen bonding in controlling the selectivity of Diels–Alder reactions in room-temperature ionic liquids

2002 ◽  
Vol 4 (5) ◽  
pp. 517-520 ◽  
Author(s):  
Ajay Aggarwal ◽  
N. Llewellyn Lancaster ◽  
Alick R. Sethi ◽  
Tom Welton
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Diels Alder ◽  
Room Temperature Ionic Liquids

scholarly journals Room Temperature Ionic Liquids in Asymmetric Hetero-Ene Type Reactions: Improving Organocatalyst Performance at Lower Temperatures

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 355
Author(s):  
Fabricio R. Bisogno ◽  
Rosario Fernández ◽  
Jose María Lassaletta ◽  
Gonzalo de de Gonzalo
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Room Temperature ◽  
Catalyst Activity ◽  
Room Temperature Ionic Liquids ◽  
Tertiary Alcohols ◽  
Tert Butyl ◽  
Keto Esters ◽  
Enantioselective Addition ◽  
Positive Effect

Room temperature ionic liquids (RTILs) have been widely used as (co)solvents in several catalytic processes modifying, in most of the cases, the catalyst activity and/or the selectivity for the studied reactions. However, there are just a few examples of their use in hydrogen bonding organocatalysis. In this paper, we show the positive effect of a set of imidazole-based ionic liquids ([bmim]BF4 and [hmim]PF6) in the enantioselective addition of formaldehyde tert-butylhydrazone to prochiral α-keto esters catalyzed by a sugar-based chiral thiourea. Reactions performed in the presence of low percentages of RTILs led to an increase of the catalyst activity, thereby making possible to work at lower temperatures. Thus, the chiral tert-butyl azomethyl tertiary alcohols could be obtained with moderate to good conversions and higher enantioselectivities for most of the studied substrates when using up to 30 vol% of [hmim]PF6 as a cosolvent in processes performed in toluene.

scholarly journals Phase-out-compliant fluorosurfactants: unique methimazolium derivatives including room temperature ionic liquids

2017 ◽  
Vol 19 (14) ◽  
pp. 3225-3237 ◽  
Author(s):  
M. Hummel ◽  
M. Markiewicz ◽  
S. Stolte ◽  
M. Noisternig ◽  
D. E. Braun ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Room Temperature Ionic Liquids ◽  
Reduced Toxicity ◽  
High Yields ◽  
Phase Out ◽  
Medicinal Drug

Fluoroalkylations of the medicinal drug 1-methyl-3H-imidazole-2-thione provide high yields of superior surfactants with reduced toxicity.

scholarly journals Room temperature ionic liquids based on cationic porphyrin derivatives and tetrakis(pentafluorophenyl)borate anion

2011 ◽  
Vol 15 (07n08) ◽  
pp. 560-574 ◽  
Author(s):  
Hai-Jun Xu ◽  
Claude P. Gros ◽  
Stéphane Brandès ◽  
Pei-Yu Ge ◽  
Hubert H. Girault ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Room Temperature ◽  
Specific Conductivity ◽  
Counter Anion ◽  
Visible Spectroscopy ◽  
Cationic Porphyrin ◽  
H Nmr ◽  
Porphyrin Derivatives ◽  
Uv Visible ◽  
High Yields

A series of 11 low melting ionic liquids based on meso-substituted A3B -porphyrins and A2B2-porphyrins containing one or two pyridyl substituents have been synthesized in high yields. Three of them are liquids at room temperature. All these porphyrinic salts were characterized by1H NMR,19F NMR, MALDI-TOF mass spectrometry, elemental analysis and UV-visible spectroscopy. The thermal properties and conductivity values of these salt derivatives have been also measured. A specific conductivity value of up to 4 mS.cm-1could be obtained for a compound having the counter-anion B(C6F5)4-.

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