一个基于Bis () 基的过度拥挤的基的动力学计算研究
Charlotte N Stindt1, Taegeun Jo2, Jorn D Steen2
1Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, Groningen 9747 AG, the Netherlands.
The journal of physical chemistry. A
|January 23, 2025
概括
这项研究揭示了 bis () 醇中复杂的分子运动. 光化学异构化和热螺旋逆转涉及合和不合的单键旋转,为分子机械设计提供了新的见解.
科学领域:
- 有机化学 有机化学
- 分子动力学分子动力学
- 超分子化学 超分子化学
背景情况:
- 控制分子运动是开发先进分子机械的关键.
- 基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基基
研究的目的:
- 从理论上阐明一个基于bis () 的过度拥挤基的动态行为.
- 为了了解这个系统内的合和不合的分子运动.
主要方法:
- 使用激发和基本状态分子动力学模拟的全面理论研究.
- 使用密度功能理论 (DFT) 计算和核磁共振 (NMR) 研究.
- 分析四种稳定适配体之间的相互转换路径.
主要成果:
- 确定了通过单键旋转相互转换的四个稳定对应体.
- 光化学E-Z异构是定向的,产生了转移稳定的异构体.
- 在异构化和热螺旋逆转 (THI) 过程中观察到的多个合和不合的通路.
结论:
- 这项研究提供了对过度拥挤的烯中的分子运动的详细了解.
- 结果为设计复杂的分子电机和功能系统提供了洞察力.
- 单键旋转的复杂相互作用影响分子动力学和异构化结果.
相关概念视频
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.3K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.3K
01:18Directing and Steric Effects in Disubstituted Benzene Derivatives
2.9K
When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
2.9K
02:36Regioselectivity and Stereochemistry of Hydroboration
8.0K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.0K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
17.8K
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.
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.
17.8K
01:07Structure of Benzene: Kekulé Model
8.5K
In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
8.5K
02:30Stability of Substituted Cyclohexanes
12.3K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
12.3K