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Related Concept Videos

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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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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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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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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Molecules with Multiple Chiral Centers02:25

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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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Stereoisomerism of Cyclic Compounds02:33

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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,...
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Stereoisomerism02:52

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Chirality sensing with stereodynamic biphenolate zinc complexes.

Keith W Bentley1, Zeus A de Los Santos1, Mary J Weiss1

  • 1Department of Chemistry, Georgetown University, Washington, D.C.

Chirality
|August 25, 2015
PubMed
Summary

New chiral sensors enable rapid enantiomeric excess (ee) analysis using circular dichroism. This method offers high-throughput screening with minimal sample and solvent use, outperforming traditional chromatography.

Keywords:
chemosensorchiral amplificationcircular dichroismenantioselective analysisstereolabile zinc complex

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Analytical Chemistry

Background:

  • Development of chiral sensors for enantiomeric excess (ee) determination is crucial in asymmetric synthesis.
  • Existing methods like high-performance liquid chromatography (HPLC) can be time-consuming and solvent-intensive.
  • Fluxional ligands offer unique opportunities for creating responsive molecular systems.

Purpose of the Study:

  • To synthesize novel bidentate ligands with a polyarylacetylene framework and terminal phenol groups.
  • To investigate the formation of stereodynamic zinc complexes with these ligands.
  • To establish a direct method for enantiomeric excess (ee) analysis using circular dichroism (CD) signals.

Main Methods:

  • Synthesis of bidentate ligands featuring a fluxional polyarylacetylene core and phenol termini.
  • Formation of diethylzinc complexes with the synthesized ligands.
  • Chiral amine and amino alcohol binding studies to induce asymmetric transformation.
  • Circular dichroism (CD) spectroscopy for monitoring chirality and determining enantiomeric excess (ee).

Main Results:

  • Successful synthesis of two novel bidentate ligands.
  • Formation of stereodynamic zinc complexes exhibiting asymmetric transformation of the first kind.
  • Observation of characteristic circular dichroism (CD) signals upon binding of chiral analytes.
  • Demonstration of direct correlation between CD signals and enantiomeric excess (ee).

Conclusions:

  • The developed chemosensing approach enables direct and sensitive enantiomeric excess (ee) analysis.
  • This method shows potential for high-throughput screening, requiring small sample volumes and reducing solvent waste.
  • The substrate-to-ligand chirality imprinting within the zinc coordination sphere is key to the CD signal generation.