二胺共价有机的动力捕捉.
Sergey Fisher1, Hsin-Hua Huang2, Luise Sokoliuk2
1Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, XH Amsterdam NL-1098, the Netherlands.
The Journal of organic chemistry
|March 18, 2025
概括
使用动态共价化学,形成了动态捕获的胺. 基团影响形成速率和稳定性,揭示了对近接组合控制的关键因素.
科学领域:
- 有机化学 有机化学
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
背景情况:
- 氨基有机通常通过动态共价化学形成,依赖于组装的错误校正.
- 了解影响这些子形成动力学和稳定性的因素对于它们的合理设计至关重要.
研究的目的:
- 为了证明动态捕获的二二胺二烯化物 [2 + 3] 的形成.
- 调查替代剂,特别是基群对形动力学和稳定性的影响.
- 探索反应中间体和环境因素在子组装中的作用.
主要方法:
- 使用动态共价化学合成二二胺 [2 + 3] .
- 用光谱和分析技术研究形成动力学和稳定性.
- 研究不同替代剂 (基组) 对前体化物的影响.
主要成果:
- 通过动态捕获的二二胺二烯化物 [2 + 3] 所获得的高产量.
- 基前体上的基团表现出双重效应:加速imine形成,但降低动力稳定性.
- 溶液中的化物和水度被确定为影响子稳定的关键因素.
- 观察到 [2 + 2] 宏观循环是形成和分解中的中间体.
结论:
- 这项研究突出了硬体和电子因素在动力控制的 imine 形成中的复杂相互作用.
- 基团充当"立体电子大麻雀",影响反应速率和产品稳定性.
- 了解这些因素对于控制热力学与动力学模式在 imine 组装中至关重要.
相关概念视频
Radical 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
Thermal 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
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement
2.6K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.6K
Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Aromatic Hydrocarbon Cations: Structural Overview
2.6K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
2.6K


