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相关概念视频

Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

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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...
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Prochirality02:05

Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

9.6K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.6K
Thermal Electrocyclic Reactions: Stereochemistry01:17

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.
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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

8.9K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
8.9K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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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.
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相关实验视频

Updated: Jul 11, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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一个依赖于溶剂的循环三四烯化物开关.

Louise Miton1, Élise Antonetti1, Diego García-López1

  • 1Aix Marseille Université, CNRS, Centrale Marseille, iSm2 UMR 7313, 13397, Marseille, France.

Chemistry (Weinheim an der Bergstrasse, Germany)
|November 13, 2023
PubMed
概括
此摘要是机器生成的。

研究人员使用循环三四烯基支架开发了一种新型的性分子开关. 溶剂的选择控制了分子的分子.

关键词:
子化合物 子化合物奇拉性是一种精神性.循环三四乙烯的使用方法分子开关 分子开关分子开关溶剂的作用是溶剂的作用.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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相关实验视频

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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科学领域:

  • 超分子化学 超分子化学
  • 有机化学 有机化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 嵌合式分子开关对于开发先进的嵌合式分子机器至关重要.
  • 基于循环三四烯 (CTV) 支架的半烯,表现出固有的性 (M或P手性) 并通常采用"外"配置.

研究的目的:

  • 设计和合成基于CTV支架的单分子合开关.
  • 为了证明在hemicryptophanes中以溶剂控制的奇拉性反转.
  • 为了探索不同性配置之间的可逆振荡.

主要方法:

  • 一种基于循环三四烯的新型半密烯的合成.
  • 使用核磁共振 (NMR),高性能液体染色学 (HPLC) 和电子循环二元化 (ECD) 的表征.
  • 计算分析包括密度函数理论 (DFT) 和分子动力学模拟.

主要成果:

  • 溶剂被证明可以控制CTV单元的"进入"和"退出"配置.
  • 创建了一个性开关,在 (M/P) "in"和 (P/M) "out"配置之间进行过渡.
  • 大量的芳香溶剂 (例如,2-t-丁) 倾向于"入"配置,而极性近距离溶剂 (例如乙) 倾向于"出"配置.

结论:

  • 基于CTV支架的可逆,溶剂控制的性分子开关成功开发.
  • 该系统展示了外部刺激 (溶剂) 的潜力,以精确控制分子性.
  • 这些发现为设计响应性合材料和分子机器开辟了新的途径.