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Sharpless Epoxidation

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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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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.
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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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Chirality in Nature02:30

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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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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons00:58

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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.
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Superenantioselective chiral surface explosions.

Andrew J Gellman1, Ye Huang, Xu Feng

  • 1Department of Chemical Engineering, Carnegie Mellon University , 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213, United States.

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|November 23, 2013
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Summary
This summary is machine-generated.

Chiral surfaces amplify small energy differences in molecules, leading to superenantiospecific decomposition rates. This discovery offers new insights into the origins of molecular chirality.

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Area of Science:

  • Surface Chemistry
  • Materials Science
  • Origins of Life

Background:

  • Chiral inorganic materials existed before life, potentially influencing biomolecular homochirality.
  • Enantioselective interactions on chiral surfaces typically yield modest enantioselectivities due to small energy differences.

Purpose of the Study:

  • To investigate superenantiospecificity arising from autocatalytic surface reactions on chiral inorganic surfaces.
  • To explore the role of nonlinear kinetics in amplifying enantioselectivity.

Main Methods:

  • Studied the decomposition of R,R- and S,S-tartaric acid on naturally chiral copper (Cu) single crystal surfaces.
  • Utilized a vacancy-mediated surface explosion mechanism with nonlinear kinetics.

Main Results:

  • Observed superenantiospecificity in the decomposition rates of tartaric acid enantiomers on chiral Cu surfaces.
  • Decomposition rates differed by up to two orders of magnitude, despite similar intrinsic rate constants.

Conclusions:

  • Autocatalytic surface explosions can amplify subtle enantioselective energy differences, leading to high superenantiospecificity.
  • This mechanism provides a potential pathway for understanding the amplification of chirality in early Earth conditions.