通过过渡金属单元稳定的异构-基类型的合成和反应性
Lisa Zimmermann1, Christoph Riesinger1, Gábor Balázs1
1Department of Inorganic Chemistry, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany.
Chemistry (Weinheim an der Bergstrasse, Germany)
|July 26, 2023
概括
这项研究报告了新的过渡金属稳定无机二氧化盐类似物. 这些化合物具有可调节的特性和稳定性,为化学研究提供了一个新的平台.
科学领域:
- 有机金属化学 有机金属化学
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
背景情况:
- 混合二基复合物与电友的反应性尚未得到充分理解.
- 有机盐是多功能合成中间体,但可能是不稳定的.
- 开发稳定的无机类似物可以提供新的合成可能性.
研究的目的:
- 为了合成和表征来自混合二基复合物的新型阴离子化合物.
- 研究电友性质对这些化合物的结构和动态的影响.
- 为了探索这些无机diazonium同类物与N-异环碳的反应性.
主要方法:
- 混合二基复合物的合成及其与14组电友的反应.
- 谱学表征 (NMR) 和X射线晶体学.
- 密度功能理论 (DFT) 的计算用于预测反应路径和同位素形成.
主要成果:
- 合成了一组 [{CpMo(CO) 2}2(μ,η2:2-EPR) ]+ 阴离子化合物库,作为无机二氧化同类物.
- 电友R的立体和电子性质显著影响P-R键的长度和动态行为.
- 这些化合物在室温下稳定,与许多有机类型不同.
- 与N- heterocyclic carbenes (NHCs) 的反应导致未被替代的原子的添加,形成两个异构体.
结论:
- 过渡金属稳定允许创建强大的无机二氧化类似物.
- 电友的立体和电子调可以控制化合物特性.
- 这些新型化合物及其与NHCs的反应在有机金属和无机合成中开辟了新的途径.
相关概念视频
Diazonium Group Substitution: –OH and –H
2.8K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.8K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
3.9K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.9K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
3.0K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
3.0K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
1.9K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.9K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
2.1K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.1K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K


