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相关概念视频

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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Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity 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...
8.0K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.6K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.6K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.1K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.1K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

2.6K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
2.6K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

3.7K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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形状持久的以基为基础的宏循环,由可逆 Ester 形成制备:结晶和结构分析.

Shoma Kasahara1, Hironobu Hayashi2, Takayuki Okumura3

  • 1Institute for Chemical Research, Kyoto University Gokasho, Uji, Kyoto, 611-0011, Japan.

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概括

研究人员开发了一种新方法来合成具有可调节空腔的形状持久的宏循环. 这些分子在纳米架构中对气体吸附和自我组装有很大的希望.

关键词:
炭二烯是一种一个水晶的水晶.一个宏观周期的宏观周期.有孔的材料是多孔的材料.可逆债券形成的形成.

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科学领域:

  • 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:

  • 形状持久的宏循环对分子识别和纳米电子学中的应用有兴趣.
  • 宏观循环内的狭窄的内部空间是它们独特性质的关键.

研究的目的:

  • 开发一个高效的合成宏循环与烯单位.
  • 研究这些宏观循环的结构和气体吸附特性.

主要方法:

  • 在1,2-二醇和酸之间形成可逆的酸.
  • 粉末X射线衍射 (PXRD) 和单晶X射线分析.
  • 测量气 (N2) 气体吸附率.

主要成果:

  • 无模板合成产生了具有内部空洞从11 Å到20 Å的宏循环.
  • 在去除溶剂和回火后,结晶性保持不变.
  • 一个含有连接物的宏循环表现出伪纳米囊行为和优异的N2吸附.

结论:

  • 为形状持久的宏循环建立了一个强大的合成策略.
  • 这些宏观循环具有气体吸附和自组装纳米架构的潜力.
  • 与相关的宏循环显示出对先进材料应用的重大前景.