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Related Concept Videos

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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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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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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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.
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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:
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Origin of Single-Molecule Reaction Chirality.

Chen Yang1, Shuyao Zhou1,2, Yilin Guo1

  • 1Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.

Research (Washington, D.C.)
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

Researchers observed single molecules breaking mirror symmetry in real time, revealing mechanisms for molecular chirality. This breakthrough offers insights into the origin of life and advances chiral synthesis and drug design.

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Area of Science:

  • * Chemistry
  • * Molecular Biology
  • * Physics

Background:

  • * The origin of molecular chirality is a fundamental unsolved problem in chemistry.
  • * Understanding how single molecules achieve chirality is key to explaining life's origins.
  • * Current methods lack the resolution to observe initial symmetry breaking events.

Purpose of the Study:

  • * To develop a method for real-time, single-molecule observation of asymmetric evolution.
  • * To directly observe spontaneous mirror symmetry breaking in a Diels-Alder reaction.
  • * To investigate the role of external factors in symmetry breaking.

Main Methods:

  • * Real-time monitoring of single-molecule trajectories using the chirality-induced spin selectivity (CISS) effect.
  • * Observation of a single-molecule Diels-Alder reaction system.
  • * Application of an external electric field to symmetry-breaking species.

Main Results:

  • * Direct observation of spontaneous mirror symmetry breaking at the single-molecule level.
  • * Identification of the excess-compensation mechanism driving chiral evolution.
  • * Demonstration of catalyst-free universal asymmetric synthesis using an external electric field.

Conclusions:

  • * The study provides unprecedented insight into the initial stages of molecular chirality.
  • * External environmental coupling significantly influences symmetry breaking.
  • * Findings have broad implications for understanding life's origins, chiral synthesis, and drug design.