Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

1.9K
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.
1.9K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

10.9K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
10.9K
Oxymercuration-Reduction of Alkenes02:36

Oxymercuration-Reduction of Alkenes

7.4K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
7.4K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.6K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.6K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.0K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

9.8K
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.
9.8K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Density functional benchmarks for methylaluminoxane: successes, biases, and transferability limits.

Physical chemistry chemical physics : PCCP·2026
Same author

Large Language Models for Accurate Medical Chart Abstraction: Enabling Scalable and Secure AI Deployment in Stroke.

AJNR. American journal of neuroradiology·2026
Same author

Enhanced third-order optical nonlinearity in a dipolar carbene-metal-amide material with two-photon excited delayed fluorescence.

Communications chemistry·2026
Same author

Olefin insertion using <i>ansa</i>-zirconocenes and methylaluminoxane (MAO) involves Janus-like, sheet anions.

Chemical communications (Cambridge, England)·2025
Same author

Ceramide test in patients with erectile dysfunction to assess cardiovascular risk.

The journal of sexual medicine·2025
Same author

Abn-BLIP: Abnormality-aligned Bootstrapping Language-Image Pre-training for pulmonary embolism diagnosis and report generation from CTPA.

Medical image analysis·2025

相关实验视频

Updated: Jun 3, 2025

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

9.5K

一个通过甲基氨酸激活金属催化剂的合作模型.

Scott Collins1, Mikko Linnolahti1

  • 1Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, FI-80100, Joensuu, Finland. mikko.linnolahti@uef.fi.

Dalton transactions (Cambridge, England : 2003)
|January 6, 2025
PubMed
概括

密度功能理论 (DFT) 研究了rac-Me2Si(η5-Ind) 2ZrMe2 (SBIZrMe2) 通过甲基氨酸 (MAO) 模型的激活. 由MAO成分形成的混合离子显著降低了烯插入障碍,这解释了高Al:Zr比率的高催化剂活性.

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.
  • 计算化学计算化学

背景情况:

  • 由甲基氨酸 (MAO) 激活的金属催化剂对于烯聚合至关重要.
  • 了解MAO激活的精确机制及其与金属的相互作用对于催化剂设计至关重要.
  • 之前的研究已经探索了各种MAO模型,但对离子对形成和烯插入障碍的详细机械洞察仍然是积极研究的领域.

研究的目的:

  • 通过密度函数理论 (DFT) 研究rac-Me2Si(η5-Ind) 2ZrMe2 (SBIZrMe2) 的激活机制.
  • 模拟甲基氨酸 (MAO) 作为板结构,并研究它们与SBIZrMe2.2的相互作用.
  • 阐明外球离子对 (OSIP) 和接触离子对 (CIP) 的形成及其对插入障碍物的影响.

主要方法:

  • 用密度函数理论 (DFT) 的计算来研究MAO板模型对SBIZrMe2的激活.
  • 该研究的重点是外部球体离子对 (OSIP) 和接触离子对 (CIP) 的可逆形成.
  • 计算了烯插入障碍和Al结合平衡以评估催化活性.

主要成果:

  • 据DFT计算,SBIZrMe2可以通过MAO模型形成OSIP和CIP.
  • 在CIP中插入烯通常会出现很高的障碍 (90-100 kJ mol-1),但混合离子 ([13,8]-) 的形成会导致障碍明显降低 (<60 kJ mol-1).

更多相关视频

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
08:25

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

7.2K
Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

3.5K

相关实验视频

Last Updated: Jun 3, 2025

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

9.5K
Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
08:25

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

7.2K
Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

3.5K
  • 模拟表明,像混合离子一样,特定的MAO衍生物种的形成解释了高Al:Zr比率的MAO激活金属的高活性.

    • 结论:

    • 从MAO成分中形成混合离子在降低烯插入障碍方面发挥着关键作用.
    • 马奥成分的物种化显著影响金属复合物的催化活性.
    • 这些发现提供了对MAO激活的更深入的机制理解,这对于优化氨酸聚合催化剂至关重要.