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

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

8.0K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
8.0K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.0K
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.
10.0K
Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

6.1K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.1K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.1K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.1K
Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

5.3K
Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
5.3K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
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...
3.2K

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

Beyond BMI: central obesity identifies overlooked fatty liver disease risk in adults with normal body mass index undergoing routine health examinations.

Frontiers in public health·2026
Same author

Spectroscopic and multivariate analysis insights into the DOM composition and distribution in a full-scale photovoltaic wastewater zero-liquid discharge system.

Water research·2026
Same author

Empagliflozin-pretreated mesenchymal stem cell-derived extracellular vesicles facilitate cardiac repair via AGGF1.

Journal of nanobiotechnology·2026
Same author

Multi-imidazolium cage-like microspheres: Synergistic multi site hydrogen bonding and geometric confinement for selective <sup>99</sup>TcO<sub>4</sub><sup>-</sup>/ReO<sub>4</sub><sup>-</sup> capture in harsh media.

Journal of colloid and interface science·2026
Same author

Construction of Isolated Pd<sub>3</sub> Geometry on GaO<sub><i>x</i></sub>-Modified Pd/Al<sub>2</sub>O<sub>3</sub> as a Highly Active and Selective Catalyst for Semihydrogenation of Acetylene.

Journal of the American Chemical Society·2026
Same author

Study on the Cytotoxic Effects, Apoptosis Induction, Treatment Resistance, and Inflammation Caused by a Gold(III) Complex Containing 3,4-diaminobenzophenone and 2,3-butanedione Monoxime on the Esophageal Cancer Cell Line KYSE-30.

Current molecular medicine·2026

相关实验视频

Updated: Jun 13, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

8.0K

使用双密氧化物/金属接口,从CO2中突破甲醇合成的转换选择性权衡

Qimeng Sun1, Xinyu Liu2,3, Qingqing Gu4

  • 1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society
|September 16, 2024
PubMed
概括

这项研究引入了一种新的InO2涂层双金属催化剂,用于高效地将二氧化碳 (CO2) 化为甲醇. 双接口设计打破了转换选择性的权衡,提高了可持续化学生产的甲醇产量.

更多相关视频

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

18.1K
Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
09:21

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

8.9K

相关实验视频

Last Updated: Jun 13, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

8.0K
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

18.1K
Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
09:21

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

8.9K

科学领域:

  • 催化剂
  • 材料科学
  • 绿色化学

背景情况:

  • 二氧化碳 (CO2) 转化为甲醇对于减少排放和资源利用至关重要.
  • 由于RWGS和甲醇分解等副作用,现有的催化剂面临转化选择性权衡.
  • 开发能够克服这种权衡的催化剂对于高效的甲醇合成至关重要.

研究的目的:

  • 设计和研究一种用于选择性二氧化碳化成甲醇的新型催化剂系统.
  • 在二氧化碳化中打破传统的转换选择性权衡.
  • 通过使用双催化接口来提高甲醇产量.

主要方法:

  • 合成 InO2 涂层的 PdCu 双金属纳米粒子 (NP).
  • 在催化剂上构建InO2/Cu和InO2/PdIn双接口.
  • 使用先进的显微镜和光谱技术进行表征.
  • 在二氧化碳化中对催化性能进行评估.

主要成果:

  • 在约20%的二氧化碳转化时,InO2/PdCu催化剂达到80%的甲醇选择性,接近热力学极限.
  • 双接口设计成功地打破了转换选择性的权衡,超过了传统的单接口催化剂.
  • InO2/PdIn接口激活了二氧化碳形成,而InO2/Cu接口则将形成转化为甲氧化物种.

结论:

  • 氧化物涂层双金属纳米粒子的双接口协同作用为催化剂设计提供了新的策略.
  • 这种方法显著提高了二氧化碳化成甲醇的选择性和活性.
  • 这些发现为开发高效的二氧化碳转化和利用催化剂铺平了道路.