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相关概念视频

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

14.5K
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...
14.5K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

9.1K
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.
9.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.9K
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...
3.9K
Electrophilic Addition to Alkynes: Hydrohalogenation02:35

Electrophilic Addition to Alkynes: Hydrohalogenation

11.6K
Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
11.6K
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

5.0K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
5.0K
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

12.6K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
12.6K

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工业规模的化物电气化通过局部化亲和工程.

Lei Shi1, Yixin Su2, Ruyi Cheng3

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, P.R. China.

Angewandte Chemie (International ed. in English)
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PubMed
概括

研究人员开发了一种新的电极,用于将化物电化为有价值的化学物质. 这种Rh装饰的铜电极实现了高效率和稳定性,为化学生产和环境修复提供了可持续的解决方案.

关键词:
在KDF生产生产.阿尔德海德电气化的电气化原子装饰 原子装饰双极两极的生产生产-亲和关系规则的规则

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 催化剂是一种催化剂.

背景情况:

  • 电化合物提供可持续的化学合成,但受到低效电极的阻碍.
  • 开发先进的电催化剂对于环境修复和资源回收的实际应用至关重要.

研究的目的:

  • 设计和合成一个高效的化物电气化的电极,使用计算引导的策略.
  • 研究新型电极的性能和机制,用于将化物转化为高价值化学品.

主要方法:

  • 以计算为指导的局部化亲和度工程来合成原子装饰的铜 (Cu) 催化剂.
  • 电化学表征,包括法拉第效率和超电位测量.
  • 操作研究和理论计算以阐明反应机制.
  • 技术经济分析用于评估商业可行性.

主要成果:

  • 一个Rh-装饰的Cu酶 (Rh1Cu-Hase) 电极在500 mA cm-2时实现了高于99.3%的法拉第效率,用于在283 mV超电位下对甲进行转换.
  • 使用Rh1Cu-Hase的无膜电解器在1000mA cm-2下经过1200小时以上的稳定运行,产生高纯度二形 (KDF) 和.
  • 技术经济分析表明,与传统方法相比,KDF生产具有显著的收入优势.
  • 该策略对于广泛的工业相关的化物有效.

结论:

  • 局部化亲和工程是开发高性能电催化剂的可行策略.
  • Rh1Cu-Hase电极可实现高效和稳定的化物电气化,为化学生产提供可持续的途径.
  • 配对脱机制,包括Cu用于吸附和Rh用于激活,是催化剂高性能的基础.