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関連する概念動画

Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

6.1K
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.
6.1K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

3.8K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
3.8K
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

4.3K
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.
4.3K
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

4.8K
Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
4.8K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

368
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
368
NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

8.9K
In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
8.9K

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関連する実験動画

Updated: Jul 15, 2025

A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s
07:38

A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s

Published on: September 25, 2017

10.1K

アロマティック・ナイトロゲン・スキャニング (ipso・セレクティブ・ナイトレン・インターナライゼーション)

Tyler J Pearson1, Ryoma Shimazumi1, Julia L Driscoll1

  • 1Department of Chemistry, University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)
|September 28, 2023
PubMed
まとめ
この要約は機械生成です。

研究者は,アリル化合物における直接的な炭素から窒素への置換のための新しい方法を開発し,薬剤発見のためのピリジン同位体の効率的な合成を可能にしました. このスムーズなプロセスは 多様な分子構造の作成を 簡素化します

さらに関連する動画

Nitropeptide Profiling and Identification Illustrated by Angiotensin II
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Nitropeptide Profiling and Identification Illustrated by Angiotensin II

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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

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関連する実験動画

Last Updated: Jul 15, 2025

A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s
07:38

A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s

Published on: September 25, 2017

10.1K
Nitropeptide Profiling and Identification Illustrated by Angiotensin II
07:31

Nitropeptide Profiling and Identification Illustrated by Angiotensin II

Published on: June 16, 2019

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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

9.4K

科学分野:

  • 有機化学
  • 薬剤化学
  • 合成方法論

背景:

  • アリル断片の窒素スキャニングは 薬の発見に不可欠です
  • 現在の方法は,ピリジル同位体の長い並列合成を必要とします.
  • 直接的な炭素と窒素 (C−N) の交換反応がないため,効率が低下する.

研究 の 目的:

  • アリルC-N置換反応を 開発する.
  • 様々なピリジン同位体への 統一されたアクセスを可能にします
  • 合成を簡素化することで 薬の発見プロセスを効率化します

主な方法:

  • アリルアジドを含む2段階の1ポット手順です.
  • アリルアジドを3Hアゼピンに光化学的に変換する.
  • スピロサイクルのアザノルカラディエンの中間体を通して,酸化的に誘発されたC2選択的なケレトロピック炭素の挤出.

主要な成果:

  • ピリジン産物の地域選択合成を成功させた.
  • 反応は,ipso-carbon 切除により基質を混乱させずに進行する.
  • ピリジルエストロン誘導体と窒素スキャンの合成で実証された応用

結論:

  • 報告された窒素内化プロセスは,新しいC-to-N置換戦略を提供します.
  • この方法は,多様なピリジン同位体を合成するためのより効率的で統一されたアプローチを提供します.
  • 反応の部位誘導性と地域選択性は,医薬品化学の応用において有利である.