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関連する概念動画

Rotation of Asymmetric Top01:11

Rotation of Asymmetric Top

1.6K
By definition, a spherically symmetric body has the same moment of inertia about any axis passing through its center of mass. This situation changes if there is no spherical symmetry. Since most rigid bodies are not spherically symmetric, these require special treatment.
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...
1.6K
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

10.0K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
10.0K
Phase Diagrams02:39

Phase Diagrams

50.5K
A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
50.5K
Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization01:13

Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

3.3K
Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
3.3K
Phase Transitions02:31

Phase Transitions

23.3K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.3K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.9K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.9K

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関連する実験動画

Updated: Feb 14, 2026

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
09:53

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

Published on: May 13, 2018

8.7K

非対称的なフローロサイクリングのためのダイアニオン相移転触媒

Hiromichi Egami1, Tomoki Niwa1, Hitomi Sato1

  • 1School of Pharmaceutical Sciences, University of Shizuoka , 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.

Journal of the American Chemical Society
|February 10, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は非対称的なフッ素化のための新しい二酸化炭素前触媒を開発した. これらの触媒は,新しい6 - エンドフローロサイクリングによって,アリルアミドからフッ素二酸化物を効率的に合成することを可能にします.

さらに関連する動画

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
10:08

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
08:19

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Published on: January 15, 2016

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関連する実験動画

Last Updated: Feb 14, 2026

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
09:53

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

Published on: May 13, 2018

8.7K
Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
10:08

Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
08:19

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion

Published on: January 15, 2016

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科学分野:

  • 有機化学
  • 非対称な触媒
  • 化化学

背景:

  • セルクトフローアのような電離性化反応剤は有機合成に不可欠です.
  • フッ素を導入するための効率的で選択的な触媒方法の開発は大きな課題です.
  • 段階移転触媒は様々な有機変異のための多用途のプラットフォームを提供します.

研究 の 目的:

  • 非対称な化のための新しい二酸化炭素前触媒の設計と合成.
  • アルケンのエナチオ選択的化におけるこれらの前触媒の触媒的活性を調べる.
  • 開発された触媒システムの範囲と限界を調査する.

主な方法:

  • セレクトフローアの構造に触発された二酸化炭素前触媒の合理的な設計.
  • アニオン相移転触媒を生成する前触媒の脱プロトン化.
  • アリルアミドとアシクリルアルケンを基質として使用した非対称な化反応.
  • キラルクロマトグラフィーとNMRスペクトロスコーピーを用いたエナンチオセレクティブとダイアステレオセレクティブの分析.

主要な成果:

  • 一連の二酸化炭素前触媒が合成され評価された.
  • 前触媒2aは,アリルアミドの6 - エンドフローロサイクリングを触媒化するのに高い効率を示した.
  • 酸ジヒドロキサジンは優れたエナチオ選択性 (最大99%) を示した.
  • アサイクリック三置換アルケンは良好なダイアステロ選択性で反応し,線形非置換アルケンは選択性が低下した.

結論:

  • 開発された二酸化炭素前触媒は,非対称的な化のためのアニオン相移転触媒として効果的に機能する.
  • 6 - エンドフッ素サイクリングは,フッ素二酸化酸化物を合成するための前例のない変換を表します.
  • 反応メカニズムはおそらくフッ素カルボケーション中間物質を含み,さらなる触媒開発のための洞察を提供します.