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関連する概念動画

Prochirality02:05

Prochirality

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...
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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...
Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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...
Chirality02:25

Chirality

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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chirality in Nature02:30

Chirality in Nature

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. The...
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Published on: February 15, 2016

キュキュルビチューリルの穴のキラル認識

Mikhail V Rekharsky1, Hatsuo Yamamura, Chika Inoue

  • 1Entropy Control Project, ICORP, JST, 4-6-3 Kamishinden, Toyonaka 560-0085, Japan.

Journal of the American Chemical Society
|November 16, 2006
PubMed
まとめ

アキラル・キュキュルビチューリル (CBs) は,キラル結合剤を用いて高いエナチオ選択性を達成する. この超分子化学の突破は,キラル分子の前例のない差別を可能にします.

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In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

関連する実験動画

Last Updated: Jul 18, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines
05:32

In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines

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科学分野:

  • 超分子化学 超分子化学
  • チラルの認識機能
  • ホスト・ゲスト・ケミストリー

背景:

  • アキラル・キュキュルビチューリル (CBs) は,キラル差別の能力が限られたマクロサイクル宿主です.
  • アキラル宿主を用いたエナンチオセレクティブ認識方法の開発は,化学における重要な課題です.

研究 の 目的:

  • 重要なエナティオメリックおよびダイアステレオメリック差別のためにアキラルキュキュルビチューリルを設計する.
  • 改変CB宿主によるキラル認識のメカニズムを調査する.

主な方法:

  • 宿主分子としてキュキュルビチューリル [6] (CB [6]) とキュキュルビチューリル [7] (CB [7]) を利用した.
  • 組み込まれたキラルアミン結合物質,特に (R) -または (S) -2-メチルピペラジン,キラル上分子宿主を作る.
  • 分析のためにカロメトリック,核磁気共鳴 (NMR),光散射,質量スペクトロメトリーを使用した.

主要な成果:

  • キラル結合剤で機能化されたアチラルCB[6]ホストは, (S) - 2 - メチルブチラミンに対する95%のエナチオ選択性を達成した.
  • これは,アキラル宿主から派生した超分子システムについて報告された最も高いエナンチオセレクティブ性を表しています.
  • CB[7]は,L-Phe-L-Leu-NH3+とL-Phe-D-Leu-NH3+のようなダイペプチドのダイアステロ選択性が8倍まで高いことを実証した.

結論:

  • 強いキラル結合物質をアキラルキュキュルビチューリルに組み込むことは,有効に重要なエナティオメリックおよびダイアステレオメリック差別能力を授与します.
  • この戦略は,超分子化学におけるキラル認識のための新しい高度に効率的なアプローチを提供します.
  • この発見は,高度なキラルセンサーと分離材料の設計に新たな道を開く.