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Related Concept Videos

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
α-Alkylation of Ketones via Enolate Ions01:10

α-Alkylation of Ketones via Enolate Ions

Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the strong interaction...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Nucleophilic Substitution Reactions02:34

Nucleophilic Substitution Reactions

Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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Related Experiment Video

Updated: May 31, 2026

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
06:31

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

An organocatalytic ionic liquid.

Zsolt Kelemen1, Oldamur Hollóczki, József Nagy

  • 1Budapest University of Technology and Economics, Department of Inorganic and Analytical Chemistry, Szent Gellért tér 4, Budapest H-1111, Hungary.

Organic & Biomolecular Chemistry
|June 25, 2011
PubMed
Summary
This summary is machine-generated.

High carbene concentration in 1-ethyl-3-methylimidazolium-acetate ionic liquid enables catalysis for benzoin condensation, hydroacylation, and alcohol oxidation. This highlights the potential of ionic liquid organocatalysts.

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
06:31

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery
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Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

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Area of Science:

  • Green Chemistry
  • Catalysis
  • Organometallic Chemistry

Background:

  • Ionic liquids (ILs) are tunable solvents with unique properties.
  • Organocatalysis utilizes small organic molecules as catalysts.
  • Carbenes are reactive intermediates with diverse catalytic applications.

Purpose of the Study:

  • To investigate the catalytic potential of carbenes generated in 1-ethyl-3-methylimidazolium-acetate ionic liquid.
  • To explore the use of this system in key organic transformations.
  • To demonstrate the synergy between ionic liquids and organocatalysis.

Main Methods:

  • Generation of carbene species within the ionic liquid.
  • Application of the catalytic system to benzoin condensation.
  • Application of the catalytic system to hydroacylation reactions.
  • Application of the catalytic system to alcohol oxidation using CO2 and air.

Main Results:

  • Sufficiently high carbene concentration was achieved in the ionic liquid.
  • The ionic liquid-derived carbene effectively catalyzed benzoin condensation.
  • Hydroacylation reactions were successfully promoted by the carbene catalyst.
  • Alcohol oxidation was achieved using CO2 and air, mediated by the carbene.

Conclusions:

  • 1-ethyl-3-methylimidazolium-acetate ionic liquid can serve as a source of catalytically active carbenes.
  • This system offers a promising approach to organocatalysis, combining IL benefits with carbene reactivity.
  • The findings underscore the potential of ionic liquid-based organocatalysts for sustainable synthesis.