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相关概念视频

Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
Polyprotic Acids03:38

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
Brønsted-Lowry Acids and Bases02:16

Brønsted-Lowry Acids and Bases

In 1923, the Brønsted–Lowry definition of acids and bases was proposed by Johannes Brønsted and Thomas Lowry. According to this theory, a Brønsted acid is defined as a species that donates a proton in a chemical reaction and gets converted to its conjugate base. A Brønsted base is defined as a species that accepts a proton in a chemical reaction and gets converted into its conjugate acid. These transfers of protons are caused by the displacement of electrons in these reactions, which is...
Amides to Carboxylic Acids: Hydrolysis01:28

Amides to Carboxylic Acids: Hydrolysis

Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.

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相关实验视频

Updated: Jun 26, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
08:46

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)

Published on: November 22, 2016

从 (eta5-C5R5)Cr(CO) 3H (R = Ph,Me,H) 转移到甲基甲酸盐和的动力学和热力学.

Lihao Tang1, Elizabeth T Papish, Graham P Abramo

  • 1Departments of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA.

Journal of the American Chemical Society
|August 14, 2003
PubMed
概括
此摘要是机器生成的。

这项研究测量了活性烯酸和化之间的H/D交换率. 化的固体质量显著影响H/D与甲基甲酸盐的交换,但不影响 styrene.

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Derivatization of Protein Crystals with I3C using Random Microseed Matrix Screening
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Synthesizing Amino Acids Modified with Reactive Carbonyls in Silico to Assess Structural Effects Using Molecular Dynamics Simulations
05:57

Synthesizing Amino Acids Modified with Reactive Carbonyls in Silico to Assess Structural Effects Using Molecular Dynamics Simulations

Published on: April 26, 2024

相关实验视频

Last Updated: Jun 26, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of Phosphorus(I)
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Published on: November 22, 2016

Derivatization of Protein Crystals with I3C using Random Microseed Matrix Screening
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Synthesizing Amino Acids Modified with Reactive Carbonyls in Silico to Assess Structural Effects Using Molecular Dynamics Simulations
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科学领域:

  • 有机金属化学 有机金属化学
  • 反应动力学反应动力学
  • 聚合化学 聚合化学 聚合化学

背景情况:

  • - (H/D) 交换反应对于理解有机和有机金属化学中的激素机制至关重要.
  • 化是重要的催化剂和试剂,它们与烯酸的反应性是各种转换的关键.
  • 量化原子转移的能量对于预测和控制反应途径至关重要.

研究的目的:

  • 测量特定激活烯酸 (甲基甲酸-d(5) 和-d(8) 和各种化之间的H/D交换率.
  • 确定从水化物转化为烯酸的原子转移 (k(reinit)) 的速率常数.
  • 为了估计关键的C-H键在中间激素和Cr-H键在化物中的键解离能 (BDE).

主要方法:

  • 在不同条件下对H/D交换反应的动力测量.
  • 使用具有不同硬质性质的化和化.
  • 计算机模拟分析基数度并确定速率常数 (k(tr)).
  • 热力学计算包括pK(a) 和DFT来确定键解离能.

主要成果:

  • 发现H/D的汇率在olefin和hydride中都是第一位的.
  • 化的固体质量显著影响了H/D与甲基甲酸盐交换的速度,但对烯的影响很小.
  • 确定了H原子转移 (k(reinit)) 和反转移 (k(tr)) 的速率常数.
  • 估计了相关基的Cr-H债券和C-H债券的债券解离能,并与DFT计算进行了比较.

结论:

  • 化的固体阻碍在初始原子转移步骤中起着重要作用,特别是在对甲基甲酸盐等固体要求高的烯酸具有重要的作用.
  • 确定的键解离能提供了有价值的热力学数据,以了解化和相关基的稳定性.
  • 这些发现为涉及这些物种的基性聚合机制以及控制链传播和终结的因素提供了洞察力.