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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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Chiral Macrocycles for Enantioselective Recognition.

Guang Sun1, Xue Zhang1, Zhe Zheng1

  • 1Academy of Interdisciplinary Studies on Intelligent Molecules, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, P.R. China.

Journal of the American Chemical Society
|September 13, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a new synthesis for chiral macrocycles, R/S-BINOL[2], achieving high yields and enantioselective recognition. These macrocycles show promise for chiral separations and display unique luminescence properties.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Efficient synthesis of chiral macrocycles is crucial for enantioselective recognition.
  • Existing methods often face challenges in yield and purification.

Purpose of the Study:

  • To synthesize a novel pair of chiral macrocycles, R/S-BINOL[2].
  • To evaluate their enantioselective recognition capabilities and luminescent properties.

Main Methods:

  • A two-step reaction sequence was employed for synthesis.
  • Purification was achieved via column chromatography on silica gel.
  • Enantioselective recognition was tested with chiral ammonium salts.

Main Results:

  • Total isolated yields of R/S-BINOL[2] reached up to 62%.
  • Enantioselectivity (K_A/K_B) values up to 13.2 were observed for chiral ammonium salts.
  • Blue circularly polarized luminescence with a |g_lum| value up to 2.2 × 10^-3 was detected.

Conclusions:

  • R/S-BINOL[2] offers a concise, high-yielding synthesis route.
  • These macrocycles exhibit promising enantioselective guest recognition.
  • The findings suggest potential applications in chiral separations and materials science.