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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

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.
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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...
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

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相关实验视频

Updated: May 30, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

在碳醇-乙烯宏循环中设计固态形态.

Aaron D Finke1, Dustin E Gross, Amy Han

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 61801, United States.

Journal of the American Chemical Society
|July 22, 2011
PubMed
概括
此摘要是机器生成的。

n-基侧链的长度显著影响了宏循环中的晶体包装. 较长的链条可能会导致新的间隙动图和溶剂通道,影响结构稳定性.

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
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Published on: September 28, 2016

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
13:58

Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics

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科学领域:

  • 超分子化学 超分子化学
  • 晶体学 晶体学是指结晶学.
  • 材料科学 材料科学 材料科学

背景情况:

  • 形状持久的宏循环在超分子化学中至关重要.
  • 控制固态包装是材料性质的关键.
  • 侧链长度对宏循环组件的影响尚未完全理解.

研究的目的:

  • 系统地调查n-基侧链长度如何影响碳醇-乙烯宏循环中的晶体包装.
  • 阐明侧链长度和固态分子间相互作用之间的关系.
  • 通过特定的基链长度引起的新型包装图案的特征.

主要方法:

  • 单晶X射线衍射分析.
  • n-基侧链长度的系统变化 (高达C11).
  • 粉末X射线衍射 (PXRD) 用于散装材料分析.
  • 用溶剂洗实验来研究客人交换和结构反应.

主要成果:

  • 晶体包装对n-基侧链长度高度敏感.
  • 面对面的芳香型π相互作用在较短的链 (高达C9) 中占主导地位.
  • 一个新的间接包装模式与C10和C11链出现,形成溶剂通道.
  • C10宏循环表现出溶剂分子交换和适应性链障碍,同时保持结晶性.
  • PXRD数据表明,较长的基链可以模仿π堆叠距离.

结论:

  • N-基侧链长度是这些宏循环中晶体包装的关键决定因素.
  • 较长的基链可以指导独特的固态架构,包括含溶剂的道.
  • 在C10宏循环中观察到的适应性行为突出显示了对客户环境的动态结构反应.
  • 在解释固态结构数据时,需要仔细考虑基 - 大环相互作用.