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相关概念视频

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

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

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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.
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.3K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
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
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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 Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.5K
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.
8.5K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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基于Resorcinarene的协调囊中的分子识别过程

Kentaro Harada1, Ryo Sekiya1, Takeharu Haino1,2

  • 1Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan.

Chemistry (Weinheim an der Bergstrasse, Germany)
|September 14, 2023
PubMed
概括

铜和银囊通过部分解离和滑动来识别有机分子. 这项研究揭示了这些宿主-客人复杂化机制如何使特定囊结构中的分子吸收成为可能.

关键词:
主持人-客人关系运动学的动力学.分子识别分子识别复苏氨烯是一种复苏氨烯.超分子化学 超分子化学

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科学领域:

  • 超分子化学 超分子化学
  • 协调化学 协调化学

背景情况:

  • 金属有机囊,如铜 (Cu) 和银 (Ag) 囊,表现出封装各种有机分子的能力.
  • 控制这种分子识别的精确机制,可能涉及囊组件的部分解离和滑动,仍然是积极研究的领域.

研究的目的:

  • 使用特定的有机探针阐明Cu和Ag囊中的分子识别过程.
  • 调查这些系统内宿主-客体复杂化中的部分解离和滑动的作用.

主要方法:

  • 采用循环二元化 (CD) 和质子核磁共振 (1H NMR) 光谱来研究分子识别.
  • 使用4,4'-diacetoxy biphenyl与乙醇组作为复杂化研究的分子探针.
  • 执行密度函数理论 (DFT) 计算,以了解结构和电子相互作用.

主要成果:

  • 发现宿主-客人复杂化通过二次反应进行.
  • 观察到囊的部分解离有助于探针吸收特定溶剂 (CDCl3和THF-d8).
  • 滑动被确定为将客人纳入具有p-methoxyphenyl组的Cu囊中的关键机制,由π/π堆叠相互作用辅助.

结论:

  • 部分解离和滑动都是Cu和Ag囊中分子识别的关键机制.
  • 囊的特定功能,如p-methoxyphenyl组的存在,可以影响主导复杂化途径.
  • DFT计算支持非共价相互作用在调节囊结构和客人可访问性方面的作用.