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関連する概念動画

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

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The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.7K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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The Replisome03:01

The Replisome

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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
34.5K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.6K

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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コバルント・プライマーを用いたH-ボンドテンプレートオリゴーマー合成

Diego Núñez-Villanueva1, Christopher A Hunter1

  • 1Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom.

Journal of the American Chemical Society
|September 9, 2022
PubMed
まとめ
この要約は機械生成です。

研究者は,共性エステル塩基対を介して結合されたプライマーを使用して,トリアゾールオリゴマーのテンプレート合成のための新しい方法を開発しました. この方法は,水素結合相互作用とテンプレート再生を通じて効率的な複製サイクルを可能にします.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

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関連する実験動画

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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科学分野:

  • 化学合成
  • 超分子化学
  • ポリマー化学

背景:

  • テンプレート誘導合成は生物学的核酸複製を模倣する.
  • プライマーの拡張は,ポリメラーゼ連鎖反応 (PCR) の重要なステップです.
  • 新しいオリゴマーの合成のための効率的な方法の開発は極めて重要です.

研究 の 目的:

  • トライアゾールオリゴマーの合成をテンプレートにするためにプライマーを付加する.
  • テンプレート誘導反応における水素結合の役割を調査する.
  • テンプレート再生による完全な複製サイクルを実証する.

主な方法:

  • 模板にプライマーをつなぐための共性エステル塩基対形成.
  • フォスフィン酸化物単体との非共性塩基配合のためのフェノール認識単位を使用する.
  • モデル効果と拘束力のあるアフィニティを評価するために競争反応を使用します.
  • P 製品構造と水素結合を確認するためのNMRスペクトロスコーピー.

主要な成果:

  • トリアゾールオリゴマーのテンプレート合成が成功しました.
  • テンプレートフェノールとフォスフィン酸化物単体間の水素結合相互作用は,反応速度を著しく加速した.
  • 酸化フォスフィンの単体結合のより高い親和度は,より大きな速度加速につながった.
  • P NMRはH結合の存在を証明し,共価と非共価の塩基対の互換性を示した.
  • エステル塩基対の水解によって正式な複製サイクルが完了した.

結論:

  • トリアゾールオリゴマーのテンプレート指向合成のための新しい方法が確立されました.
  • 水素結合は反応速度と特異性を高める上で重要な役割を果たします.
  • 開発されたシステムは,共振的および非共振的ベースペアリング戦略の幾何学的な互換性を示しています.
  • この研究は人工複製システムを開発するための基盤を提供します.