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Related Concept Videos

Prochirality02:05

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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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

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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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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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Stereoisomers02:32

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On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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Radical Halogenation: Stereochemistry01:33

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Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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Related Experiment Video

Updated: Apr 8, 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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Stereochemical Communication within a Chiral Ion Pair Catalyst.

Christian Merten1, Corina H Pollok2, Saihu Liao3

  • 1Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum (Germany). christian.merten@ruhr-uni-bochum.de.

Angewandte Chemie (International Ed. in English)
|June 24, 2015
PubMed
Summary

Chiral anions can induce asymmetry in achiral cations, influencing enantioselective catalysis. Vibrational circular dichroism (VCD) spectroscopy quantifies this stereochemical information transfer and its impact on asymmetric reactions.

Keywords:
asymmetric catalysisasymmetric counterion-directed catalysis (ACDC)chirality transferionic interactionsvibrational circular dichroism

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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Area of Science:

  • Asymmetric catalysis
  • Chiral recognition
  • Spectroscopy

Background:

  • Ionic interactions are crucial in enantioselective catalysis but often poorly understood.
  • Achiral cations can adopt chiral conformations influenced by chiral counterions.
  • Understanding stereochemical information transfer is key to designing efficient asymmetric catalysts.

Purpose of the Study:

  • To demonstrate how an enantiopure anion enforces a chiral conformation onto an achiral cation.
  • To utilize vibrational circular dichroism (VCD) spectroscopy for monitoring stereochemical information transfer.
  • To correlate chiroptical data with enantioselectivity in asymmetric catalysis.

Main Methods:

  • Employing vibrational circular dichroism (VCD) spectroscopy.
  • Investigating the interaction between a chiral phosphate anion and a manganese(III)-salen cation.
  • Studying solvent effects on the chiral induction process.
  • Correlating VCD spectral data with enantioselectivity in asymmetric olefin epoxidation.

Main Results:

  • An enantiopure anion was shown to induce a specific chiral conformation in a flexible achiral manganese(III)-salen cation.
  • VCD spectroscopy successfully monitored the transmission of stereochemical information from the anion to the cation.
  • Solvent effects on the chiral induction were elucidated using VCD.
  • A direct quantitative correlation was established between VCD data and observed enantioselectivity.

Conclusions:

  • VCD spectroscopy is a powerful tool for studying ionic interactions in asymmetric catalysis.
  • Stereochemical information transfer from chiral anions to achiral cations can be quantitatively measured.
  • This approach provides fundamental insights into enantioselective catalytic mechanisms and catalyst design.