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相关概念视频

Ethers from Alkenes: Alcohol Addition and Alkoxymercuration-Demercuration02:35

Ethers from Alkenes: Alcohol Addition and Alkoxymercuration-Demercuration

8.0K
Overview
Ethers can also be prepared from alkenes through acid-catalyzed addition of alcohols and alkoxymercuration–demercuration.
Preparation of Ethers by Acid-Catalyzed Addition of Alcohol to Alkenes
The acid-catalyzed addition of alcohol to an alkene involves treating the alkene with an excess of alcohol in the presence of an acid catalyst to form an ether under suitable conditions. The hydrogen will add to the less substituted carbon so that the nucleophile can attack the more...
8.0K
Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

14.1K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
14.1K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.2K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.2K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.1K
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...
12.1K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.9K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.9K
Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

3.3K
The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene...
3.3K

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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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直接将甲转化为烯的方法

Yunpeng Hou1,2, Yuxiang Lan1,2, Chao Qian1,2

  • 1College of Chemical and Biological Engineering, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Zhejiang University, 310027 Hangzhou, P. R. China.

Research (Washington, D.C.)
|September 11, 2023
PubMed
概括

这项研究引入了一种新的催化剂,用于将甲转化为有价值的碳化合物,如乙烯和. 石墨碳化物支持的酸催化剂在350°C时有效地产生烯酸.

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Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations
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科学领域:

  • 催化剂是一种催化剂.
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 甲的非氧化合 (NOCM) 提供了一条通往有价值的碳化合物和的途径.
  • 在催化过程中,甲直接选择性转化为烯仍然是一个重大挑战.

研究的目的:

  • 开发一种用于将甲选择性转化为乙烯和的新型催化剂.
  • 研究甲转化为烯的催化性能和活性位点.

主要方法:

  • 合成了一种具有 (Ta) 原子分散良好的催化剂,该原子被石墨碳化物 (C3N4) 支持的酸 (phthalocyanine) 定.
  • 催化剂结构和活性位点的表征.
  • 在350°C的甲转化过程中对催化性能进行评估.

主要成果:

  • 开发的催化剂可以选择性地将甲转化为乙烯和.
  • 在相对较低的350°C温度下实现了高效的烯生产.
  • 该研究阐明了催化剂的活性中心及其性能的起源.

结论:

  • 石墨C3N4支持的酸催化剂对甲转化为烯酸具有很高的选择性.
  • 这种催化剂代表了甲非氧化合的有希望的进步,用于生产增值碳化合物.