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

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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...
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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.
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.

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

Understanding Love in Couple Relationships: A Scoping Review of Sternberg's Triangular Theory.

Psychological reports·2026
Same author

tmQM-RDF Data Set: A Knowledge Graph Representing Transition Metal Complexes.

Journal of chemical information and modeling·2026
Same author

A wire to life: Emergency endovascular repair of a ruptured iliac mycotic pseudoaneurysm.

Journal of vascular surgery·2026
Same author

Air- and Water-Persistent C‑Centered Radical Anion Based on FLP-Type-Activated CO<sub>2</sub>.

JACS Au·2026
Same author

Methane Catalytic Amidation via a Plausible Copper-Nitrene Intermediate.

Journal of the American Chemical Society·2026
Same author

Leveraging Diamines to Unlock the Mn-MACHO Catalyst in the Reduction of CO<sub>2</sub> to Methanol.

Angewandte Chemie (International ed. in English)·2026

相关实验视频

Updated: May 14, 2026

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
10:19

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

引入铜作为氧化脱的催化剂.

Ana Conde1, Laia Vilella, David Balcells

  • 1Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencia de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible, Universidad de Huelva, Campus de El Carmen, 21007 Huelva, Spain.

Journal of the American Chemical Society
|February 16, 2013
PubMed
概括

铜催化剂与trispyrazolylborate连接物促进使用过氧化的n-hexane和cycloalkane脱. 这种新的过程产生了酒精和,并形成了小基,与典型的芬顿式反应不同.

更多相关视频

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

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

相关实验视频

Last Updated: May 14, 2026

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
10:19

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

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

科学领域:

  • 催化剂是一种催化剂.
  • 有机金属化学 有机金属化学
  • 氧化反应 氧化反应

背景情况:

  • 过氧化是催化过程中的多功能氧化剂.
  • 铜复合物是各种有机转变的有效催化剂.
  • 三二醇酸连接物稳定金属中心并影响反应性.

研究的目的:

  • 用铜复合物和过氧化来研究n-hexane和cycloalkanes的催化脱.
  • 阐明反应机制,包括活性物种和关键中间体的性质.
  • 探索对氧化和脱产品的选择性.

主要方法:

  • 使用铜复合物的催化反应与trispyrazolylborate连接物和过氧化.
  • 实验分析以确定反应产物并排除激进机制.
  • 密度功能理论 (DFT) 研究以建模反应途径和活性物种.

主要成果:

  • 实现了n-hexane和cycloalkanes的催化脱到n-hexene和cycloalkenes的催化脱.
  • 反应主要产生氧化产物 (酒精和),少量基.
  • DFT研究表明,一个铜氧物种是活性发起者,通过H抽象进行.
  • 从三联到单联状态的旋转交叉对于催化剂回收和产品分销至关重要.

结论:

  • 开发了一种使用过氧化进行碳化合物功能化的新型催化系统.
  • 该机制涉及铜-氧物种和旋转交叉,使其与芬顿类工艺区别开来.
  • 该研究提供了一个全面的机制性建议,得到实验和计算证据的支持.