相关实验视频

Updated: May 22, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

具有碳基骨架的非无氧化解氧无害双烯复合物

Artemis Saddington¹, Shenglai Yao¹, Christian Lorent²

¹Department of Chemistry: Metalorganics and Inorganic Materials, Technische Universität Berlin Strasse des 17. Juni 115, Sekr. C2 Berlin 10623 Germany matthias.driess@tu-berlin.de.

Chemical science

|March 17, 2025

概括

新的-复合物使用氧化还原非无害的正氧-碳联体进行了合成. 这些复合物表现出多个连接体氧化状态,并且可以被减少以形成新的中间体.

科学领域:

有机金属化学有机金属化学
碳化合物的化学成分
和化学和化学

背景情况:

双乙烯基正态碳联体具有独特的化和电子性质.
这些配体在合成具有低氧化状态金属的复合物中非常有价值.
捐赠体稳定 (II) → (III) 复合物是新型化合物的潜在前体.

研究的目的:

通过使用氧化还原性非无害 bis-silylenyl ortho-carborane 连接物合成新的供体稳定 Si(II) → Al(III) 复合物.
为了研究碳酸骨干的氧化还原非无罪对产生的复合物的影响.
探索这些复合物的降解和低氧化状态中间体的形成.

主要方法:

提供者稳定Si (II) →Al (III) 复合物的合成.
具有中性,激素阳离子和二阳离子碳酸核心的复合物的表征.
使用/纳来诱导 dearomatization 反应的减少性研究.

主要成果:

成功合成了 [AlI2+] 复合体,其中包括三种不同的联结体氧化状态的正体碳素骨干 (中性closo-, 极端阳离子closo-, 和 dianionic nido-).
通过 [1+4] 循环添加,实现了复合物的减少与/石甲,通过 [1+4] 循环添加产生{K[SiII(CCcage) SiII]Al(C10H8)}衍生物.
在 dearomatization 机制期间识别过渡性低氧化状态的中间体 (激素和/或乙烯).

结论:

正氧-碳联体的氧化还原性非无害性使得-复合体中各种氧化状态的稳定.
合成的复合物作为低氧化状态物种的前体.
涉及过渡性基/氨基的拟议机制提供了对 dearomatization 反应的洞察力.

更多相关视频

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

Published on: November 30, 2022

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

相关概念视频

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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.

Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids

Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids

Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
Reducing carboxylic acid derivatives like acyl chlorides (RCOCl), esters (RCO2R′), and nitriles (RCN) using milder aluminum hydride agents like lithium tri-tert-butoxyaluminum hydride [LiAlH(O-t-Bu)3] and diisobutylaluminum hydride [DIBAL-H]...

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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.

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Carboxylic Acids to Primary Alcohols: Hydride Reduction

Carboxylic Acids to Primary Alcohols: Hydride Reduction

Carboxylic acids, upon reaction with strong reducing agents such as lithium aluminum hydride followed by hydrolysis, undergo reduction to form primary alcohols.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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.