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Chirality

Chirality

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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality at Nitrogen, Phosphorus, and Sulfur

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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...

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 in Nature

Chirality in Nature

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...

Stereoisomerism of Cyclic Compounds

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...

Prochirality

Prochirality

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: Jun 28, 2026

A Micropatterning Assay for Measuring Cell Chirality

A Micropatterning Assay for Measuring Cell Chirality

Published on: March 11, 2022

How Much Chirality is Enough?

Michel Rickhaus¹, Tomáš Šolomek², Michal Juríček³

¹Department of Organic Chemistry, University of Geneva, CH-1205 Geneva. Michel.Rickhaus@unige.ch.

|June 26, 2026

Summary

This summary is machine-generated.

Chirality in chemistry is strictly binary, not a matter of degree. This study distinguishes between easily interconvertible enantiomers and topologically chiral molecules whose forms cannot be altered without breaking bonds.

Keywords:

Configurational stability Enantiomerization Racemization Rigid chirality Topological chirality

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Area of Science:

Molecular Chemistry
Stereochemistry
Mathematical Chemistry

Background:

Chirality is commonly described as a continuous property in chemistry.
Mathematical definitions of chirality are strictly binary: a molecule is either chiral or achiral.
Existing classifications may obscure fundamental distinctions in molecular chirality.

Purpose of the Study:

To re-examine molecular chirality using geometric and topological principles.
To differentiate between topologically trivial and non-trivial chiral molecules.
To clarify the relationship between classical and topological chirality.

Main Methods:

Geometric and topological analysis of molecular structures.
Categorization of stereochemical motifs based on deformability.
Illustration using selected model systems.

Main Results:

Most common chiral motifs (central, axial, planar, helical) are topologically trivial.
Enantiomers of topologically trivial chiral molecules are interconvertible via continuous deformation.
Topologically chiral molecules (e.g., knotted architectures) have non-interconvertible enantiomers.

Conclusions:

Molecular chirality is fundamentally binary, with two distinct classes based on deformability.
Topological chirality represents a distinct class of molecules whose enantiomers cannot be interconverted.
Understanding topological constraints is crucial for observing, preserving, and utilizing molecular chirality.