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Related Concept Videos

Chirality in Nature02:30

Chirality in Nature

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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.
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Chirality02:25

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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.
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...
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Prochirality02:05

Prochirality

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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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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons

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Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
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Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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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 with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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...
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Biological Homochirality and the Search for Extraterrestrial Biosignatures.

Marcelo Gleiser1

  • 1Department of Physics and Astronomy, Dartmouth College, Hanover, NH, 03755, USA. mgleiser@dartmouth.edu.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|August 15, 2022
PubMed
Summary

Life

Keywords:
Early planetary environmentsHomochiralityOrigin of lifePrebiotic chemistry

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Area of Science:

  • Astrobiology
  • Origin of Life
  • Chirality

Background:

  • Life on Earth exhibits homochirality, using only L-amino acids and D-sugars.
  • The origin of this fundamental asymmetry remains a significant scientific mystery.
  • Understanding homochirality is key to understanding life's origins.

Purpose of the Study:

  • To review potential mechanisms for the emergence of biological homochirality on early Earth.
  • To explore the astrobiological implications of these mechanisms.
  • To connect Earth's homochirality to the search for extraterrestrial life.

Main Methods:

  • Review of theoretical and experimental studies on homochirality.
  • Analysis of three proposed mechanisms: stochastic processes, circularly-polarized UV radiation, and parity violation.
  • Examination of observational consequences for detecting enantiomeric excesses.

Main Results:

  • Three distinct mechanisms for homochirality are presented: environmental fluctuations, stellar radiation, and fundamental physics.
  • Each mechanism predicts different observable signatures of chirality.
  • These signatures can be sought in our solar system and on exoplanets.

Conclusions:

  • The origin of life's homochirality may be deciphered by studying extraterrestrial environments.
  • Searching for enantiomeric excesses on other planets can illuminate Earth's biological origins.
  • Astrobiological investigations are crucial for solving the homochirality puzzle.