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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...

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.

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...

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Symmetry Breaking by Consecutive Amplification: Efficient Paths to Homochirality.

Laura Huber¹, Oliver Trapp^2,3

¹Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, Munich, Germany.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life

|August 19, 2022

Summary

Investigating single-molecule reaction kinetics reveals how interlocking processes amplify chiral symmetry breaking. This offers insights into the prebiotic origins of homochirality and life

Keywords:

Autocatalysis Chiral symmetry breaking Origin of homochirality Prebiotic complexity Single molecule reaction kinetics

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Last Updated: Aug 31, 2025

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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A Micropatterning Assay for Measuring Cell Chirality

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Published on: March 11, 2022

Area of Science:

Molecular kinetics
Prebiotic chemistry
Origins of life

Background:

Chiral symmetry breaking is crucial for homochirality, a key feature of life.
Understanding molecular-level mechanisms is essential for explaining life's origins.

Purpose of the Study:

To develop a method for efficiently investigating single-molecule reaction kinetics.
To explore the role of autocatalysis and reaction cascades in chiral symmetry breaking.
To examine the dependence of symmetry breaking on randomness in prebiotic systems.

Main Methods:

Simulated reactions starting with a single catalyst molecule and a substrate.
Analysis of reaction kinetics at the single-molecule level.
Modeling of autocatalytic systems and reaction cascades.

Main Results:

Interlocking processes, such as catalyst formation and cascading reactions, can significantly amplify symmetry breaking.
Kinetic acceleration arises from these interconnected reaction pathways.
Symmetry breaking's dependence on randomness was quantified.

Conclusions:

Complex reaction networks can amplify weak initial symmetry breaking events.
These findings provide a framework for experimental investigation of homochirality's emergence.
The study suggests mechanisms for a shift from thermodynamic equilibrium in early life.