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関連する概念動画

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.8K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.8K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.9K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
1.9K
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
6.0K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.2K
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...
3.2K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

8.7K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.7K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.1K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.1K

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関連する実験動画

Updated: Aug 3, 2025

Fluorescence Based Primer Extension Technique to Determine Transcriptional Starting Points and Cleavage Sites of RNases In Vivo
10:51

Fluorescence Based Primer Extension Technique to Determine Transcriptional Starting Points and Cleavage Sites of RNases In Vivo

Published on: October 31, 2014

27.2K

コンパクト・ロタキサン・スーパーベース

Martin J Power1, David T J Morris1, Iñigo J Vitorica-Yrezabal1

  • 1Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

Journal of the American Chemical Society
|April 11, 2023
PubMed
まとめ
この要約は機械生成です。

研究者は新しい有機超塩基であるアミン冠エーテルロタキサンを開発し,高塩基性と低核性を提供した. これらの化合物は簡単に合成され,安定性を示し,様々な化学用途に有望である.

さらに関連する動画

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle
10:05

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Published on: March 5, 2019

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
05:48

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

8.1K

関連する実験動画

Last Updated: Aug 3, 2025

Fluorescence Based Primer Extension Technique to Determine Transcriptional Starting Points and Cleavage Sites of RNases In Vivo
10:51

Fluorescence Based Primer Extension Technique to Determine Transcriptional Starting Points and Cleavage Sites of RNases In Vivo

Published on: October 31, 2014

27.2K
Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle
10:05

Studying RNA Interactors of Protein Kinase RNA-Activated during the Mammalian Cell Cycle

Published on: March 5, 2019

6.5K
Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
05:48

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

8.1K

科学分野:

  • 超分子化学
  • 有機化学
  • 材料科学

背景:

  • 効果的なスーパーベースの開発は,高い基本性,安定性,合成の容易さが必要であり,同時に核愛性を最小限に抑えることが困難である.
  • 核愛性によって引き起こされる望ましくない副作用は,従来のスーパーベースの有用性を制限することができます.

研究 の 目的:

  • オーガニック・スーパーベースの新しいファミリー:コンパクト・アミン・クラウン・エーテル・ロタキサン.
  • 塩基性,安定性,核愛性,合成アクセシビリティなどの特徴を評価する.

主な方法:

  • ロタキサン構造を作るために,金属のない活性テンプレート合成が用いられました.
  • ロタキサンの特徴付けには,アセトニトリルにおけるpKaH+値の決定が含まれていた.
  • モデルデプロトネーション反応で化学的安定性と性能を評価した.

主要な成果:

  • アセトニトリルではpKaH+値が32.2に達し,相互結合していない成分を大幅に上回る.
  • モデル反応でアルキル化よりもデプロトネーションの化学的安定性と高い選択性を実証した.
  • ロタキサンは,フォスファゼンのスーパーベースに匹敵する性質を示す.

結論:

  • コンパクトなアミン冠エーテルロタキサンは,有機スーパーベースの有望な新しいクラスを表しています.
  • 高塩基性,低核性,合成の容易さなどの好ましい性質は,合成と材料化学の応用に適しています.