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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
17.7K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
6.7K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.3K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Directing Effect of Substituents: meta-Directing Groups01:09

Directing Effect of Substituents: meta-Directing Groups

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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
6.6K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

5.8K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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原子置換による線形および周期的なPKS中間物質のモデリング

Gaurav Shakya1, Heriberto Rivera, D John Lee

  • 1Departments of Molecular Biology and Biochemistry, Chemistry, and Pharmaceutical Sciences, University of California , Irvine, California 92697, United States.

Journal of the American Chemical Society
|November 20, 2014
PubMed
まとめ
この要約は機械生成です。

研究者は,ポリケチド合成酵素 (PKS) を真似する原子置換方法を開発しました. これらの模倣は,PKS酵素が鎖の延長と循環の間に基質を結合し,PKSのメカニズムとプロセシビティを明らかにする方法を明らかにします.

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科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • 有機化学 オーガニック・ケミストリー

背景:

  • ポリケチド合成酵素 (PKSs) は,多様な天然製品の生産に不可欠です.
  • PKSメカニズムの理解は,一時的な中間体の不安定さによって妨げられています.
  • 現在の方法は,詳細な研究のためにこれらの中間物質にアクセスするために苦労しています.

研究 の 目的:

  • 安定したポリケチド中間物質の準備のための新しい戦略を開発する.
  • これらの中間物質を用いて基質結合とPKSプロセシビティを調査する.
  • PKS機能におけるアシルキャリアタンパク質 (ACP) の役割を明らかにする.

主な方法:

  • ポリケトンサロゲート (模倣薬) を合成するための原子置換戦略.
  • アクチノロジンACP (actACP) を使用して,基板関連性を研究する.
  • タンパク質核磁気共鳴 (NMR) スペクトロスコーピーは,タンパク質と基板の相互作用を視覚化します.
  • 安定した周期的中間物質の結合運動の評価.

主要な成果:

  • テトラケチド基板はactACPと結合しないが,より長い基板 (ヘプタケチド,オクタケチド) は強く結合する.
  • 安定したサイクルミミックは,より短いアナログと比較して,actACPでより長い滞在時間を示しています.
  • ACP基板関連は,ケトリデクタゼの作用の前と後の両方で発生します.

結論:

  • 原子置換は,PKSメカニズムを研究するための貴重なツールを提供します.
  • ACPは,PKSのタイミングとプロセス性において重要な役割を果たします.
  • 開発されたミミティックは,幅広いPKSシステムに適用できます.