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Stereoisomers02:32

Stereoisomers

13.0K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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Isomerism02:43

Isomerism

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Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
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Stereoisomerism02:52

Stereoisomerism

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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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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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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,...
8.9K
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

11.8K
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...
11.8K
Fischer Projections02:18

Fischer Projections

13.3K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Interconverting mirror-image molecules.

Sojung F Kim1, Richmond Sarpong1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.

Science (New York, N.Y.)
|October 26, 2023
PubMed
Summary
This summary is machine-generated.

A novel catalyst uses light to control molecular handedness in mixtures. This advancement offers new ways to create specific chiral molecules for various applications.

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Area of Science:

  • Chemistry
  • Photochemistry
  • Catalysis

Background:

  • Chirality is crucial in pharmaceuticals and materials science.
  • Controlling chirality in molecular mixtures remains a significant challenge.
  • Developing efficient and selective methods for chiral induction is highly desirable.

Purpose of the Study:

  • To develop a novel light-driven catalyst for enhancing chirality.
  • To investigate the multitasking capabilities of the catalyst in molecular mixtures.
  • To demonstrate a new approach for asymmetric synthesis.

Main Methods:

  • Utilized a photoactive catalyst for enantioselective transformations.
  • Employed spectroscopic techniques to monitor reaction progress and chirality.
  • Analyzed molecular mixtures to quantify enantiomeric excess.

Main Results:

  • The catalyst successfully enhanced chirality in molecular mixtures under light irradiation.
  • Demonstrated the catalyst's ability to perform multiple functions, including activation and chiral induction.
  • Achieved high levels of enantioselectivity in the target molecules.

Conclusions:

  • Light-driven catalysis offers a powerful tool for controlling molecular chirality.
  • The developed multitasking catalyst provides an efficient route to enantiomerically enriched compounds.
  • This work opens new avenues for asymmetric synthesis and chiral material design.