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Reactions of Carboxylic Acids: Introduction01:41

Reactions of Carboxylic Acids: Introduction

3.3K
Carboxylic acids possess an acidic –COOH functional group. The acidity can be attributed to the resonance stabilization of their conjugate base, wherein the negative charge is delocalized over both oxygen atoms.
3.3K
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

2.9K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
2.9K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
Carbocations02:10

Carbocations

11.8K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
11.8K
Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents01:13

Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents

5.0K
Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
5.0K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.2K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.2K

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

11.0K

マイクロドロップレットによる反応カルバニオン捕獲

Anubhav Kumar1, Supratim Mondal1, Mohammad Mofidfar2

  • 1Department of Chemistry, Indian Institute of Science Education and Research Tirupati, Tirupati 517507, India.

Journal of the American Chemical Society
|April 22, 2022
PubMed
まとめ
この要約は機械生成です。

水中の微小粒子は,有機反応から生じる短命なカルバニオン中間物質を安定させ,質量スペクトロメーターによるリアルタイム検出を可能にします. この突破は,反応機構とカルバニオン安定化に関する新しい洞察をもたらします.

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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment

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Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
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Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications

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Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
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Microfluidic On-chip Capture-cycloaddition Reaction to Reversibly Immobilize Small Molecules or Multi-component Structures for Biosensor Applications
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科学分野:

  • 有機化学
  • 物理化学
  • 分析化学

背景:

  • カーバニオンは多くの有機的および生物学的反応における一時的な中間物質である.
  • 水性環境は通常,カルバニオンの急速な消滅につながり,研究を制限する.
  • カーバニオンの直接観察は,その短い寿命のために困難です.

研究 の 目的:

  • 反応性カルバニオン中間物質を捕捉し安定させるための水性マイクロドロップルの可能性を調査する.
  • クラシックな有機反応におけるカルバニオンをリアルタイムで検出し,機械的に研究できるようにする.
  • 溶媒の組成と電荷密度がカルバニオン捕獲効率に及ぼす影響を調査する.

主な方法:

  • カーバニオン中間物質を分離し安定させるため,水分微小粒子を利用した.
  • 検出のため,消吸収電圧イオン化質量スペクトロメトリ (DESI-MS) を使用した.
  • アルドールとノエベナゲル凝縮,アルキル酸化,ライマー・ティーマンの反応を研究した.
  • 溶媒の組成 (例えば,水とメタノールの混合物と純粋な水) とマイクロドロップの電荷密度.

主要な成果:

  • 4つの異なる有機反応からカルバニオン中間物質を捕獲し安定させました.
  • この難解な種を リアルタイムで検知し 新しい機械的な洞察を 提供しました
  • 水とメタノールのマイクロドロップルは,純粋な水と比較して,カルバニオンを捕獲する上で優れた性能を示した.
  • マイクロドロップレットにおけるカルバニオンとカルボカチオン間の差別的行動が観察され,以前の発見と対照的である.

結論:

  • 水性マイクロドロップルは,活性カルバニオン中間物質の安定化と研究のための新しいプラットフォームを提供します.
  • この技術は,有機反応のリアルタイムメカニズム的調査を容易にする.
  • マイクロドロップレットの溶媒組成は,水とメタノールの混合物がカルバニオンに対して有効であることで,充電された中間物質の安定化に重要な役割を果たします.