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関連する概念動画

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Chain Reactions01:29

Chain Reactions

Chain reactions involve highly reactive transient species, such as atoms or free radicals, as intermediates. These intermediates facilitate rapid reactions over an extended period. The process includes a series of steps: a reactive intermediate is consumed, reactants are converted to products, and the intermediate is regenerated. This cycle enables continuous repetition, amplifying the production of products with a small amount of intermediate. Chain reactions often utilize free radicals as...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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関連する実験動画

Updated: Jul 19, 2026

Composite Scaffolds of Interfacial Polyelectrolyte Fibers for Temporally Controlled Release of Biomolecules
11:13

Composite Scaffolds of Interfacial Polyelectrolyte Fibers for Temporally Controlled Release of Biomolecules

Published on: August 19, 2015

ペプチドデンドリマーによる選択的触媒.

Céline Douat-Casassus1, Tamis Darbre, Jean-Louis Reymond

  • 1Department of Chemistry & Biochemistry, University of Berne, Freiestrasse 3, CH-3012 Berne, Switzerland.

Journal of the American Chemical Society
|June 24, 2004
PubMed
まとめ

この研究では,ペプチド樹状体における選択的触媒が初めて実証されました. これらの新しい構造は,特定の化学反応を加速し,酵素のような運動性を示す.

科学分野:

  • 超分子化学 超分子化学
  • カタリシス カタリシス カタリシス
  • オーガニック・シンセシス オーガニック・シンセシス

背景:

  • ペプチド dendrimersは,潜在的触媒的アプリケーションを持つ複雑なマクロ分子です.
  • 以前の研究でデンドリマー合成が研究されているが,選択的触媒は依然として課題である.

研究 の 目的:

  • 選択的触媒のペプチドデンドリマーを合成し,特徴づけること.
  • これらの dendrimersの触媒的活動と運動を調査するために.
  • 触媒機構における特定のアミノ酸の役割を明らかにする.

主な方法:

  • 3,5-アミノベンゾ酸を組み込んだペプチドデンドリマーの固体相合成.
  • ディスルファイドブリッジ形成により, dendritic 構造が生成されます.
  • 様々な基質を用いたエステル水解の運動研究.
  • アミノ酸交換実験で,触媒作用を調査する.

主要な成果:

  • 21のホモ・ヘテロディメア・ペプチド・デンドリマーが合成されました.
  • 4つのデンドリマーは,特定のエステル基板に対する触媒活性を示した.

さらに関連する動画

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

Green Synthesis, Characterization, Encapsulation, and Measurement of the Release Potential of Novel Alkali Lignin Micro-/Submicron Particles
07:42

Green Synthesis, Characterization, Encapsulation, and Measurement of the Release Potential of Novel Alkali Lignin Micro-/Submicron Particles

Published on: March 1, 2024

関連する実験動画

Last Updated: Jul 19, 2026

Composite Scaffolds of Interfacial Polyelectrolyte Fibers for Temporally Controlled Release of Biomolecules
11:13

Composite Scaffolds of Interfacial Polyelectrolyte Fibers for Temporally Controlled Release of Biomolecules

Published on: August 19, 2015

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
10:22

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

Green Synthesis, Characterization, Encapsulation, and Measurement of the Release Potential of Novel Alkali Lignin Micro-/Submicron Particles
07:42

Green Synthesis, Characterization, Encapsulation, and Measurement of the Release Potential of Novel Alkali Lignin Micro-/Submicron Particles

Published on: March 1, 2024

  • 基板結合と速度加速 (kcat/kuncat > 10^3) を含む,酵素のような動態が観察されました.
  • ヒスティジンは重要な触媒残留物として特定され,静電性および水性相互作用が基質結合に影響を与えます.

    • 結論:

    • ペプチド dendrimersは,選択的触媒を達成するために設計することができます.
    • これらの発見は,ペプチド dendrimersで選択的触媒の最初の実証を表しています.
    • この研究は,人工酵素としてのペプチド dendrimersの可能性を強調しています.