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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 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...

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...

Properties of Enantiomers and Optical Activity

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...

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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...

Chirality at Nitrogen, Phosphorus, and Sulfur

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

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A Micropatterning Assay for Measuring Cell Chirality

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Chirality: a relational geometric-physical property.

¹Department of Chemistry, University of Bayreuth, Bayreuth, Germany.

|August 23, 2013

Summary

Chirality, defined by Lord Kelvin, is a geometric-physical property describing relationships between objects. It is often confused with an object's individual chiral sense.

Area of Science:

Crystallography
Geometric Physics
Chemical Sciences

Background:

Lord Kelvin's definitions of chirality in 1893 and 1904 are foundational.
Contemporary understanding often conflates relational chirality with absolute configuration.

Purpose of the Study:

To re-evaluate Lord Kelvin's definition of chirality.
To clarify the distinction between relational and absolute chirality.
To analyze the historical context of crystallography in defining chirality.

Main Methods:

Historical analysis of scientific literature.
Examination of Lord Kelvin's definitions.
Crystallographic principles applied to geometric properties.

Main Results:

Keywords:

chirality: homochiral or heterochiral sense of chirality space inversion invariant

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Chirality is fundamentally a relational geometric-physical property.
Two possible relations exist between isometric objects: homochiral and heterochiral.
The term chirality is frequently misused in scientific literature.

Conclusions:

Clarifying the relational nature of chirality is crucial.
Distinguishing between relational and absolute chirality prevents misinterpretation.
Accurate terminology enhances scientific communication in fields utilizing chirality.