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Molecules with Multiple Chiral Centers

Molecules with Multiple Chiral Centers

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...

Chirality

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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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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. The...

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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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Related Experiment Video

Updated: May 17, 2026

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers

Published on: August 18, 2017

Chiral and chemical oscillations in a simple dimerization model.

Michael Stich¹, Celia Blanco, David Hochberg

¹Centro de Astrobiología (CSIC-INTA), Ctra de Ajalvir km 4, 28850 Torrejón de Ardoz (Madrid), Spain. stich@cab.inta-csic.es

Physical Chemistry Chemical Physics : PCCP

|October 16, 2012

Summary

This study explores the activation-polymerization-epimerization-depolymerization (APED) model for chiral polymerization. The minimal APED model demonstrates spontaneous chiral oscillations in enantiomeric excess due to chemical species concentration fluctuations.

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Area of Science:

Chemical kinetics
Polymer chemistry
Chirality studies

Background:

Chiral polymerization is crucial for synthesizing enantiomerically pure compounds.
Non-catalytic chiral polymerization frameworks are less explored.
Understanding the emergence of chirality is a fundamental challenge.

Purpose of the Study:

To investigate the APED model for spontaneous chiral solution emergence.
To analyze the dynamics of chiral oscillations in a non-catalytic polymerization system.
To elucidate the relationship between species concentrations and enantiomeric excess oscillations.

Main Methods:

Theoretical modeling using the APED framework.
Analysis of a minimal APED model for dimerization.
Detailed examination of oscillation patterns in enantiomeric excess.

Main Results:

The minimal APED model for dimerization spontaneously generates chiral oscillations.
Oscillations in enantiomeric excess are directly linked to fluctuating species concentrations.
The model provides a non-catalytic pathway for observing chiral phenomena.

Conclusions:

The APED model offers a viable framework for understanding non-catalytic chiral polymerization.
Spontaneous chiral oscillations are a predictable outcome of the minimal APED dimerization model.
This work contributes to the fundamental understanding of chirality emergence in chemical systems.