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Related Concept Videos

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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 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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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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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.
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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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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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Researchers developed novel synthetic strategies to access highly enantioenriched inherently chiral macrocycles (ICMs), expanding their potential in catalysis and materials science.

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Area of Science:

  • Organic Chemistry
  • Stereochemistry
  • Supramolecular Chemistry

Background:

  • Molecular chirality is crucial, with enantiomers often exhibiting distinct biological effects.
  • Inherently chiral molecules (ICMs) lack conventional chiral elements, deriving chirality from their curved, nonplanar macrocyclic structure.
  • The synthesis and application of ICMs remain underexplored due to challenges in obtaining enantiopure forms.

Purpose of the Study:

  • To develop efficient synthetic methodologies for producing highly enantioenriched inherently chiral macrocycles (ICMs).
  • To explore the structural characteristics, chiroptical properties, and potential applications of ICMs.

Main Methods:

  • Developed three primary strategies: de novo synthesis, desymmetrization of symmetric macrocycles, and dynamic kinetic resolution (DKR) of racemic macrocycles.
  • Utilized analytical HPLC with chiral stationary phases for enantiomer separation.
  • Investigated catalytic enantioselective synthesis and supramolecular catalysis.

Main Results:

  • Successfully developed and implemented three novel strategies for the efficient synthesis of enantiomerically enriched ICMs.
  • Demonstrated that ICMs serve as a versatile platform for fabricating chiroptical materials and chiral catalysts.
  • Established methods for structural characterization and absolute configuration assignment of ICMs.

Conclusions:

  • Advancements in synthetic methodology enable the rational design and precise construction of novel ICMs.
  • The increased availability of enantioenriched ICMs is expected to stimulate research in chemistry, materials science, and life sciences.
  • ICMs offer unique advantages in molecular recognition, asymmetric catalysis, and functional materials.