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Prochirality02:05

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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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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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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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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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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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Recent advances in chiral recognition using macrocyclic receptors.

Xiaotong Liang1, Wenting Liang2, Wanhua Wu1

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Synthetic macrocycles enable chiral recognition, crucial for life and industry. Recent advances highlight how unique cavity structures in these molecules drive strong enantioselectivity and reveal recognition mechanisms.

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Area of Science:

  • Chemistry, Supramolecular Chemistry, Organic Chemistry

Background:

  • Chiral recognition is vital in biological systems and chemical applications like drug synthesis.
  • Synthetic receptors, particularly supramolecular macrocycles, are key tools for understanding and utilizing stereoselective processes.
  • Macrocycles with specific cavity features (e.g., endofunctionalization, rigidity) show promise for enhanced chiral recognition.

Purpose of the Study:

  • To review recent advancements in strongly enantioselective chiral macrocycles.
  • To analyze recognition mechanisms based on macrocyclic cavity properties.
  • To identify potential patterns and challenges in cavity-controlled chiral recognition.

Main Methods:

  • Literature review of recent studies on chiral macrocycles.
  • Categorization of macrocycles based on cavity structural characteristics.
  • Analysis of reported enantioselectivity and proposed recognition mechanisms.

Main Results:

  • Several macrocyclic receptors with high enantioselectivity have been developed.
  • Unique cavity features, such as rigidity and endofunctionalization, are linked to strong chiral recognition.
  • Different cavity structures lead to distinct chiral recognition mechanisms.

Conclusions:

  • Supramolecular macrocycles are powerful tools for enantioselective chiral recognition.
  • Understanding the relationship between cavity properties and recognition mechanisms is crucial for designing new receptors.
  • Further research is needed to uncover regularities and address challenges in this field.