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Related Concept Videos

Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only in the...
E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
Pericyclic Reactions: Introduction01:17

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SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.
SN2 Reaction: Mechanism02:27

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The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
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Updated: Jun 6, 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

Ionic liquid structure-induced effects on organic reactions.

Annegret Stark1

  • 1Institute for Technical Chemistry and Environmental Chemistry, Friedrich-Schiller University Jena, Lessingstr. 12, 07743, Jena, Germany, annegret.stark@uni-jena.de.

Topics in Current Chemistry
|November 26, 2010
PubMed
Summary
This summary is machine-generated.

Designing effective ionic liquids requires understanding cation and anion interactions. This study reviews experimental and computational data to clarify how ionic liquid structure influences organic reactions, especially nucleophilic substitutions.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

Area of Science:

  • Ionic Liquids
  • Organic Chemistry
  • Physical Chemistry

Background:

  • Designing ionic liquids (ILs) with optimal performance necessitates understanding constituent interactions with reactants.
  • While anion basicity is understood, cation effects on substrate activation remain challenging.
  • Cation-derived interactions involve hydrogen bonding and ion pair effects, complicating relative ordering.

Purpose of the Study:

  • To summarize trends in experimental and computational investigations of binary ionic liquid-model system interactions.
  • To draw conclusions about structure-induced effects of ionic liquids in organic reactions.
  • To specifically address effects relevant to nucleophilic substitution reactions.

Main Methods:

  • Physico-chemical measurements
  • Spectroscopic measurements
  • Computational studies of binary IL-substrate mixtures

Main Results:

  • Qualitative order of anion basicity (hydrogen bond acceptor potential) is well-established.
  • Basicity of the anion often influences observed effects attributed to the cation.
  • Determining a relative order for cation interactions is still in early stages.

Conclusions:

  • Understanding cation and anion interactions is crucial for designing targeted ionic liquid solvents.
  • Ionic liquid structure significantly impacts substrate activation in organic reactions.
  • Further research is needed to fully elucidate cation-specific effects in ionic liquid chemistry.