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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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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: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
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...
3.3K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.3K
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.
10.3K
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

1.8K
Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
1.8K
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

3.4K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
3.4K

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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使用基于DMAP的Pd-催化剂进行碳基转换,通过Ex Situ CO生成.

Pallabi Halder1, Ashif Iqubal1, Krishanu Mondal1

  • 1Department of Chemistry and Chemical Biology, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India.

The Journal of organic chemistry
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概括
此摘要是机器生成的。

一种新的复合物使得无素氨基碳化和碳化苏吉-米亚乌拉合. 这种高效的方法使用作为一氧化碳来源来合成有价值的制药化合物.

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科学领域:

  • 有机金属化学 有机金属化学
  • 合成有机化学 合成有机化学
  • 催化剂是一种催化剂.

背景情况:

  • 催化碳酸合反应对于合成有价值的有机化合物至关重要.
  • 传统的方法通常需要氨酸连接物和高压一氧化碳,这给安全和成本带来了挑战.

研究的目的:

  • 开发一种新的,高效的,不含的,用于氨基碳化和碳化木-米亚乌拉合的新方案.
  • 为了利用新的复合物和安全的,廉价的一氧化碳来源进行这些转换.

主要方法:

  • 一种新型复合物的合成和表征, [PdII(DMAP) 2(OAc) 2].
  • 应用"-COware"系统用于使用作为一氧化碳替代物的碳化.
  • 开发一个COware-RB设置,用于连续的单合成.

主要成果:

  • 这种新型的复合物,[PdII(DMAP) 2(OAc) 2,有效地催化了氨基碳化和碳化苏基-米亚乌拉合,只需5%的分子负载.
  • 成功合成了诸如CX-516,CX-546和farampator之类的药学相关化合物.
  • 使用COware-RB设置,证明了印第诺伊索基诺林的连续单合成.

结论:

  • 已经建立了一个无氨酸,高效和安全的碳酸合物的催化系统.
  • 开发的方法为合成复杂分子提供了具有成本效益和实用的方法.
  • 该协议促进了重要的药物中间体和候选药物的合成.