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Related Concept Videos

Chirality in Nature02:30

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...
Prochirality02:05

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...
Chirality02:25

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 Sulfur02:30

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 Centers02:25

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...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Chirality and chemical processes: a few afterthoughts.

Pedro Cintas1

  • 1Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias-UEX, Avenida de Elvas s/n, Badajoz, Spain. pecintas@unex.es

Chirality
|October 3, 2007
PubMed
Summary

This article clarifies the precise definition and correct application of chirality and chiral terms across scientific disciplines. It aims to reduce ambiguity and promote universally correct statements for researchers and students.

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Area of Science:

  • Chemistry
  • Biochemistry
  • Physics
  • Life Sciences

Background:

  • The terms "chirality" and "chiral" are fundamental concepts across numerous scientific fields.
  • Widespread use of these terms has led to confusion and ambiguity in their application.
  • Misapplication, particularly linking chirality to stereodynamics and physico-chemical transformations, is prevalent in scientific literature.

Purpose of the Study:

  • To address and clarify the correct usage and context of chirality and chiral terminology.
  • To promote a higher level of rigor in scientific statements involving these concepts.
  • To provide guidance for both novice and experienced researchers.

Main Methods:

  • Conceptual analysis of the term "chirality" and its derivatives.
  • Review of current literature for common misuses.
  • Discussion of stereochemistry principles and correct terminology.

Main Results:

  • Identified widespread ambiguity and improper application of chiral terminology in scientific literature.
  • Highlighted the distinction between intrinsic chirality and its application in processes like chiral discrimination or synthesis.
  • Emphasized the need for precise language in scientific communication.

Conclusions:

  • Reinforcing the correct definition and application of chirality is crucial for scientific clarity.
  • Promoting rigorous and universally correct statements will enhance understanding across disciplines.
  • This work serves as a guide to prevent conceptual perversion and ensure accurate scientific discourse.