相关实验视频

Updated: Jun 23, 2025

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

一个基于N-异环碳素的拉钉系统及其在氧化条件下的多功能反应性

Haobin Li¹, Bo Zhang¹, Rui Feng¹

¹Department of Chemistry, Capital Normal University, Beijing 100048, China. guoshuai@cnu.edu.cn.

Dalton transactions (Cambridge, England : 2003)

|June 24, 2024

概括

这项研究探讨了使用N-异环碳素 (NHC) 具的高价值化学. 研究人员研究了Pd(II) 复合物的氧化,揭示了NHC器反应性和催化中的稳定性.

科学领域:

有机金属化学有机金属化学
催化剂是一种催化剂.
协调化学协调化学

背景情况:

基于N- heterocyclic carbene (NHC) 的器被广泛用于支持复合物的配体.
之前的研究主要集中在 ((II) 的氧化状态上,使高价值的化学性得不到充分的研究.
了解Pd(II) /Pd(IV) 催化中的NHC子行为对于反应的发展至关重要.

研究的目的:

用NHC^Aryl^NHC子连接体合成和表征新型 (II) 复合物.
为了研究这些Pd(II) 复合物的氧化到更高的氧化状态.
在催化相关的氧化条件下探索NHC的反应性和降解途径.

主要方法:

一系列Pd(II) 复合物的合成,其中包括NHC^Aryl^NHC钉平台.
使用各种氧化剂的氧化反应,包括基替代物和电友反应剂.
由此产生的高价值类物种的表征和连接体行为的分析.

主要成果:

通过NHC^Aryl^NHC器连接物成功制备了Pd(II) 复合物.
生产稳定,高价值的-NHC复合物,这些复合物很少被报告.
证明NHC捐赠者充当观众,而中央的亚里尔部分表现出多样化的反应能力.

结论:

该NHC^Aryl^NHC钉框架支持稳定的高价值物种.
中央基可以作为非无害的连接体,影响反应性.
这项工作扩大了对高价值化学和NHC连接体在催化过程中的行为的理解.

更多相关视频

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

Published on: August 17, 2018

相关概念视频

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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.

Pericyclic Reactions: Introduction

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems

Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems

Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...

Regioselectivity of Electrophilic Additions-Peroxide Effect

Regioselectivity of Electrophilic Additions-Peroxide Effect

In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.