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Related Concept Videos

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Racemic Mixtures and the Resolution of Enantiomers02:30

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A racemic mixture, or racemate, is an equimolar mixture of enantiomers of a molecule that can be separated using their unique interaction with chiral molecules or media. Racemic mixtures are denoted by the (±)- prefix. This ‘optical rotation descriptor’ applies to the whole solution of a racemic mixture rather than a specific stereoisomer. Enantiomers typically have the same physical and chemical properties. Hence, they are not easily separable. However, enantiomers can exhibit...
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SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
14.2K
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

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The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
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Related Experiment Video

Updated: May 3, 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
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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

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Solvent-driven chiral-interaction reversion for organogel formation.

Guangyan Qing1, Xingxing Shan, Wenrui Chen

  • 1State Key Laboratory of Advanced Technology for Materials, Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070 (P.R. China).

Angewandte Chemie (International Ed. in English)
|January 24, 2014
PubMed
Summary
This summary is machine-generated.

Nonchiral solvents can precisely control chiral gel interactions, enabling tunable material properties and selective enantiomer separation. This discovery offers new possibilities for smart gel applications.

Keywords:
chiral gelschiral recognitionhost-guest systemsself-assemblysolvent effects

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Thermal Scanning Conductometry TSC as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Controlling stereoselective interactions in chiral gels is crucial for precise material property modulation.
  • Translating molecular-level chiral information into macroscopic material behavior remains a challenge.

Purpose of the Study:

  • To investigate the influence of nonchiral solvents on chiral gel formation and stereoselective interactions.
  • To demonstrate the application of this phenomenon in selective enantiomer separation.

Main Methods:

  • Organogel formation using chiral components.
  • Modulation of gelation processes with various nonchiral solvents.
  • Analysis of self-assembly morphology and gelation kinetics.
  • Application in the separation of quinine enantiomers.

Main Results:

  • Nonchiral solvents can induce a chiral-interaction reversion during organogel formation.
  • Significant differences in gelation speed and self-assembly morphology were observed based on solvent choice.
  • Successful selective separation of quinine enantiomers was achieved using the developed chiral gel system.

Conclusions:

  • Nonchiral solvents offer a novel and precise method to modulate stereoselective interactions in chiral gels.
  • This approach allows for the development of "smart" gel materials with tunable macroscopic properties.
  • The findings have implications for advanced separation technologies and chiral material design.