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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.0K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
4.0K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.8K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
5.8K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

11.2K
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,...
11.2K
Septins01:19

Septins

2.3K
Septins are protein filaments forming the cytoskeleton along with the microtubules, microfilaments, intermediate filaments, and other accessory proteins. In 1971 while studying the cell division cycle in mutant Saccharomyces cerevisiae Harwell et al. first identified the septin-related genes playing a crucial role in yeast cytokinesis. Fluorescence microscopy revealed that these proteins localize at the budding neck as rings. These ring-like proteins were then named Septins by John Pringle, and...
2.3K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.9K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
3.9K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

4.1K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
4.1K

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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
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円状 に 配置 さ れ た 六重 トリプティセン ゲア 分子

Hitoshi Ube1, Ryo Yamada1, Jun-Ichi Ishida1

  • 1Department of Chemistry, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|October 25, 2017
PubMed
まとめ
この要約は機械生成です。

研究者達は6つのトリプチネ製のギアで 新しい分子ギアシステムを合成しました ルーテニウム複合体の接続は,ギアを制限

さらに関連する動画

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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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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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
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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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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
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科学分野:

  • 分子力学と 超分子化学
  • 有機合成と触媒
  • 材料科学について

背景:

  • ナノスケール工学にとって トリプチネ基の分子機械は 極めて重要です
  • 複雑な分子構造を 制御された動きで設計するのは 難しいことです

研究 の 目的:

  • 六重トリプチーネギア分子を 合成する
  • これらの分子ギアの 機械的な関わりと動きを 調べるために
  • 機械的な結合を通して 分子運動を制御する可能性を 探求する

主な方法:

  • コバルト触媒によるトリメリゼーションによるトリイン前駆体合成.
  • 単一結晶X線微分を用いた構造的特徴化.
  • 核磁共振 (NMR) スペクトロスコーピーによるダイナミックな行動分析.

主要な成果:

  • ヘキサキス ((10-ドデシロキシ-9-トリプチチル) エチニルベンゼンを合成し,この分子には6つのトリプチーンのギアが組み込まれている.
  • トリプチーネギアが固体状態で 緊密に動いていることを確認しました
  • NMRを用いて溶液中の分子運動を観察し,特徴づけました.
  • 単一のギアに大型ルテニウム (RuCp*) 複合体を固定したときに,ギア全体の動きが制限されていることが実証されています.

結論:

  • 合成された分子は,制御された分子運動の可能性がある機能的なマルチギアシステムを表しています.
  • 分子ギアの集団的動きを 制御する鍵となるものです
  • この研究は,スイッチング機能を備えた分子伝送システムの開発のための基礎を提供します.