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関連する概念動画

Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
Acidity and Basicity of Carboxylic Acid Derivatives01:25

Acidity and Basicity of Carboxylic Acid Derivatives

Carboxylic acids are the strongest among organic acids, as they readily lose the hydroxyl proton to form a resonance-stabilized carboxylate ion. In comparison, the acid derivatives lack acidic hydrogens directly attached to a functional group. In these compounds, the acidic nature arises from their ability to lose α hydrogens, making them weakly acidic.
The relative acidic strength of the derivatives can be explained based on the extent of resonance stabilization of the conjugate base. The...
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

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 acid...
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen double...
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).

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関連する実験動画

Updated: Jul 4, 2026

Determination of the Gas-phase Acidities of Oligopeptides
11:00

Determination of the Gas-phase Acidities of Oligopeptides

Published on: June 24, 2013

幅広い基板の範囲を持つ実用的なオレフィンアジリディネーション.

Tung Siu1, Andrei K Yudin

  • 1Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, Canada M5S 3H6.

Journal of the American Chemical Society
|January 24, 2002
PubMed
まとめ
この要約は機械生成です。

この研究は,有毒な反応剤を避ける有機リドックス反応のための電気化学的方法を提示しています. オレフィンをアジリジンに効率的に変換するには,N-アミノフタリミドと選択的電気化学的ポテンシャルを使用します.

さらに関連する動画

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays
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Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays

Published on: November 29, 2014

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
04:38

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions

Published on: July 28, 2022

関連する実験動画

Last Updated: Jul 4, 2026

Determination of the Gas-phase Acidities of Oligopeptides
11:00

Determination of the Gas-phase Acidities of Oligopeptides

Published on: June 24, 2013

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays
08:48

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays

Published on: November 29, 2014

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
04:38

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions

Published on: July 28, 2022

科学分野:

  • オーガニック電気化学
  • グリーン・ケミストリー (Green Chemistry) とは
  • 合成有機化学 合成有機化学とは

背景:

  • 伝統的な有機リドックス反応は,しばしばステキオキサンダーと金属添加物のステキオメトリック量に依存しています.
  • これらの反応剤は環境と安全性の問題を提起し,よりクリーンな合成方法論の開発を必要としています.
  • オレフィンの選択的機能化は,特に類似のリドックスポテンシャルを持つ基質を扱う場合,困難である可能性があります.

研究 の 目的:

  • オーガニック・レドックス反応に対する合理的で環境に害のないアプローチを開発する.
  • 電気化学を用いた効率的なアジリディネーションプロセスを実証する.
  • 電気化学的ポテンシャル制御を活用して,選択的な基板変換を達成するために.

主な方法:

  • 簡単に入手できるN-アミノフタリミドを窒素源として利用した電気化学合成.
  • レドックス反応を駆動する応用ポテンシャル連続体の適用.
  • 選択性を制御するために,電極表面における異質な反応条件の活用.

主要な成果:

  • 高い効率で,電子が豊富なオレフィンと,電子が少ないオレフィンの両方のアジリディネーションが成功しました.
  • 類似のリドックスポテンシャルを持つ基板間の電気化学的差別の実証.
  • 超電位現象と電子伝送の運動阻害現象に選択性の付与.

結論:

  • 電気化学的方法は,伝統的な有機酸化還元反応の持続可能な代替案を提供し,有毒な反応剤の必要性を排除します.
  • 説明されているアジリディネーションプロセスは,効率的で汎用性があり,幅広いオレフィン基板に適用できます.
  • 反応選択性に対する電気化学的制御は,複雑な有機合成のための強力なツールを提供します.