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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
Preparation of Nitriles01:12

Preparation of Nitriles

One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Rate-Determining Steps03:08

Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

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Nitropeptide Profiling and Identification Illustrated by Angiotensin II
07:31

Nitropeptide Profiling and Identification Illustrated by Angiotensin II

Published on: June 16, 2019

銅で触媒化されたチロシン窒素化.

Liang Qiao1, Yu Lu, Baohong Liu

  • 1Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.

Journal of the American Chemical Society
|November 4, 2011
PubMed
まとめ
この要約は機械生成です。

銅イオンは,Fentonのようなメカニズムでチロシン窒素化を触媒化し,酵素経路を模倣する. この研究は,銅が銅であることを明らかにしています.

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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
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A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones

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Nitropeptide Profiling and Identification Illustrated by Angiotensin II
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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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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
  • 化学生物学 化学生物学とは
  • 神経科学は神経科学である.

背景:

  • タイロジン窒素化は,神経変性疾患における窒素性ストレスのマーカーである.
  • 通常,反応性窒素種によって化学的に誘導されるか,または過酸化酵素によって酵素的に誘導される.
  • 精密な触媒機構,特に金属イオンを含むものは,さらなる解明を必要とします.

研究 の 目的:

  • タイロシン窒素化を触媒化する銅イオンの役割を調査する.
  • 銅触媒による窒素化の化学的メカニズム,特に酵素経路に関する研究を行う.
  • タイロシン窒素化およびその分析を質量スペクトロメトリで研究するためのマイクロリアクターシステムを開発する.

主な方法:

  • 電子スプレーイオン化質量スペクトロメトリーと組み合わせたマイクロリアクターの開発.
  • 銅イオン,過酸化水素,窒素酸塩の存在下でのチロシン濃縮の調査.
  • 銅イオン,ニートリート,チロシンを含む急性形成とスキャビングメカニズムの分析.

主要な成果:

  • 銅イオンとその複合体は,強力なフェントン触媒として作用し,ヒドロキシルラジカルを生成します.
  • これらのラジカルは,ニートリートとチロシンとの反応を通じて,ポリペプチドのチロシン窒素化につながります.
  • 銅はまた,酸化窒素,酸素,過酸化水素を含む窒素化を触媒化し,その多価な役割を強調しています.

結論:

  • 銅イオンはチロシン濃縮の触媒として多面的な役割を果たします.
  • この発見は,窒素性ストレスの根底にある化学的メカニズムについての洞察を提供します.
  • この研究は,金属イオン触媒による翻訳後の改変を分析するための新しいアプローチを提供します.