循环金属和中离子胺的相互作用:固态度和催化反应性
Richard Rudolf1, Biprajit Sarkar1,2
1Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
Inorganic chemistry
|November 22, 2024
概括
中介离子胺 (MII) 具有独特的电子特性和反应性. 它们的复合物表现出多样化的协调行为和催化活性,包括罕见的稳定Cp*Ir复合物和新型双循环化合物.
科学领域:
- 有机金属化学 有机金属化学
- 协调化学 协调化学
- 超分子化学 超分子化学
背景情况:
- 半性胺 (MII) 是一种具有矛盾电子结构的新型化合物.
- 内部和分子间的键显著影响MII的反应性和光谱性质.
- 循环金属化复合物为探索新的化学转换提供了多功能平台.
研究的目的:
- 为了合成和表征基于三醇的新型介质性胺素 (MII).
- 研究MII与循环金属化复合物的协调化学.
- 探索这些有机金属复合物的反应性和催化应用.
主要方法:
- 基于三醇的MII的合成.
- 循环金属化复合物的形成和表征 (Cp*Ir-MII).
- 光谱分析 (UV-vis) 和X射线晶体学.
- 与各种基质 (PPh3,CO,亚酸,乙烯,基) 的反应.
- 催化转移化研究.
主要成果:
- 合成了两种具有强烈分子内和分子间结的MII.
- 循环金属化复合物形成协调不和物种或二聚体,取决于替代剂.
- 获得了稳定的Cp*Ir复合物与CO和乙烯配体.
- 观察到双C-H激活和形成不寻常的双自行车式双自行车.
- 该Cp*Ir-MII复合体证明了作为转移化催化剂的活性.
结论:
- 介质性伊米因是有机金属化学的多功能连接体.
- Cp*Ir-MII复合体表现出独特的反应性,包括C-H激活和催化.
- 这些发现突显了MII在开发新型过渡金属复合物和催化系统方面的潜力.
更多相关视频
10:17Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
6.9K
12:19Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
Published on: November 29, 2018
8.4K
相关概念视频
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K
01:33Radical Reactivity: Intramolecular vs Intermolecular
1.7K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.7K
01:16Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview
4.4K
Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
4.4K
01:17Pericyclic Reactions: Introduction
8.2K
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
8.2K
02:52Stereoisomerism
11.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.8K
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.0K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.0K