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関連する概念動画

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,...
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Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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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Prochirality02:05

Prochirality

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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 at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

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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.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Stereoisomers02:32

Stereoisomers

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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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Chirality02:25

Chirality

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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.
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...
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調節可能なステレオインバーションバリアを持つキラル分子ケージ

Wen-Bin Gao1, Zhihao Li1, Tianyi Tong1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Journal of the American Chemical Society
|August 1, 2023
PubMed
まとめ

研究者らはダイナミックな顔回転四面体 (FRT) を開発した. そのキラリティは,フッ素アニオンとエナチオピュアフェニルエタノールによって制御され,ダイナミック・ステレオ化学の新たな洞察を提供することができる.

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科学分野:

  • 超分子化学
  • 有機化学
  • ステレオ化学

背景:

  • 急速な相互変換のエナチオマーにおけるダイナミックキラリティの制御は,特に超分子レベルで重要な課題である.
  • 立体対称性の破裂とホモキラリティの理解は 立体化学制御の進歩に不可欠です

研究 の 目的:

  • ダイナミックなステレオ変異を可能にする新しい顔回転四面体 (FRT) の分子ケージを合成する.
  • ラセミゼーションバリアの局所調節とFRTシステムにおけるヒラリティの誘導のための方法を調査する.

主な方法:

  • 顔回転四面体 (FRT) の合成,トリデュリルボランの顔単位を使用する.
  • FRTのキラル決議
  • フッ素アニオン結合によるラセミゼーションバリアの局所調節
  • エナチオピュアフェニルエタノールによるヒラリティ誘導

主要な成果:

  • 合成されたFRTは,エナティオメリックプロペラのような形状の間のステレオ変異を示しています.
  • エナティオピュアFRTのラセミゼーションバリアは,可逆的なフッ素アニオン結合によってうまく調節されます.
  • エナンチオピュアフェニルエタノール添加は,FRTで1つのエナンチオマーに好ましい結合によってキラリティを効果的に誘導する.

結論:

  • この研究は,超分子システムにおけるダイナミック・キラリティの制御のための新しいパラダイムを導入します.
  • 開発されたFRTシステムは,非対称合成とダイナミック・ステレオ化学における潜在的な応用を持つ調整可能なステレオ化学を実証している.