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相关概念视频

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

10.1K
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.
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Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

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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...
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Acid-Catalyzed Dehydration of Alcohols to Alkenes02:35

Acid-Catalyzed Dehydration of Alcohols to Alkenes

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In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
22.3K
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

3.4K
Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is...
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Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

3.2K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
3.2K
Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

3.6K
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...
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相关实验视频

Updated: May 4, 2026

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

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在催化过程中将乙醇转化为1-butanol

Shaomin Fu1, Zhihui Shao1, Yujie Wang1

  • 1Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University , Beijing 100084, China.

Journal of the American Chemical Society
|August 19, 2017
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新型的催化剂,用于将乙醇升级为1-butanol,这是一种有价值的生物燃料. 这种可持续的过程使用非贵金属催化剂,为化石燃料提供了有效的替代品.

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科学领域:

  • 催化剂
  • 绿色化学
  • 可再生能源

背景情况:

  • 生物质乙醇是可持续燃料生产的关键可再生原料.
  • 将乙醇转化为更高价值的生物燃料,

研究的目的:

  • 探索一个高效的催化格尔贝特型凝结乙醇到1-butanol.
  • 首次使用同质非贵金属催化剂将乙醇升级为更高的酒精.

主要方法:

  • 在百万分之一 (ppm) 的水平上使用了明确的.
  • 将乙醇选择性凝结为1-butanol.
  • 进行了机械学研究,包括对照实验,NMR光谱和X射线晶体学.

主要成果:

  • 使用同质催化剂实现了选择性转化乙醇为1-butanol.
  • 具有很好的催化性能,转换次数高 (>110,000) 和转换频率高 (>3000小时-1).
  • 确定了催化剂的"N-H部分"和关键反应中间体的关键作用.

结论:

  • 开发了一种可持续和高效的方法来从乙醇中合成1-butanol.
  • 建立了一个新的非贵金属催化系统,用于升级可再生原料.
  • 为生产生物燃料的催化格尔贝特类反应提供了机械洞察力.