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相关概念视频

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
3.8K
Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

4.1K
Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
4.1K
Acid Halides to Carboxylic Acids: Hydrolysis01:01

Acid Halides to Carboxylic Acids: Hydrolysis

3.5K
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...
3.5K
Preparation of Acid Anhydrides01:07

Preparation of Acid Anhydrides

3.9K
One of the methods for preparing symmetrical or unsymmetrical acid anhydrides involves the treatment of acid chlorides with the sodium salt of carboxylic acids. The reaction proceeds via a nucleophilic acyl substitution.
The carboxylate ion acts as a nucleophile that attacks the carbonyl carbon of the acid chloride to form a tetrahedral intermediate. Subsequently, the re-formation of the carbonyl group with the loss of the chloride ion as a leaving group leads to the formation of an acid...
3.9K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

4.0K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
4.0K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

12.5K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
12.5K

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Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
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一个优化的协议,用于酶的低酸合成.

Alexander I Kostyuk1,2, Gleb S Oleinik2,3, Vladimir A Mitkevich4

  • 1Institute of Translational Medicine, Pirogov Russian National Research Medical University, 117997 Moscow, Russia.

Methods and protocols
|December 24, 2025
PubMed
概括

研究人员开发了一种改进的合成低酸 (HOSCN) 的方法,这是一种对细胞毒性研究至关重要的活性氧化剂. 这个新协议显著增加了HOSCN产量,使得更有效的大规模实验.

关键词:
这里是HOSCN.酶合成酶的合成低酸类酸的使用.低硫酸酸是一种低硫酸.乳酸氧化酶的使用方法

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科学领域:

  • 生物化学 生物化学
  • 细胞生物学 细胞生物学
  • 毒理学 毒理学 毒理学

背景情况:

  • 反应性氧化剂,如低酸 (HOSCN),对于研究分子毒性机制至关重要.
  • 血红素过氧化酶的产物HOSCN是不稳定的,需要在现场进行酶合成.
  • 现有的HOSCN合成协议在高密度细胞培养中产生的度不足.

研究的目的:

  • 系统地审查和比较现有的HOSCN合成协议.
  • 为提高HOSCN产量和度开发一个优化的协议.
  • 为提供HOSCN准备和测量的详细,逐步指南.

主要方法:

  • 系统的分类和出版的HOSCN合成协议的比较.
  • 优化试剂比率,化时间和HOSCN制备温度.
  • 使用序列染色学净化乳氧化酶 (阴子交换,疏水相互作用,尺寸排除).
  • 从硫酸盐 (SCN-) 和过氧化 (H2O2) 合成HOSCN的酶合成.
  • 对合成的HOSCN度的测量.

主要成果:

  • 以先前发表的HOSCN合成协议实现的最高度约为1.9mM.
  • 开发的优化协议成功地将HOSCN产量提高到2.9mM.
  • 与现有方法相比,这代表了产品产量的60%的改善,促进了大规模的实验.

结论:

  • 优化的协议为HOSCN产量提供了显著的改善,克服了以前方法的局限性.
  • 这种增强的协议适用于需要更高氧化剂度的大规模基于细胞的测定.
  • 详细的方法方便可重复的HOSCN合成用于毒理学研究.