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相关概念视频

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.8K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
2.8K
Enolate Mechanism Conventions01:15

Enolate Mechanism Conventions

2.1K
When a carbonyl compound is treated with a strong base, the α position gets deprotonated to give a resonance-stabilized intermediate called an enolate. Enolates are ambident nucleophiles because they possess two nucleophilic sites that can attack an electrophile owing to the delocalization of the negative charge between the α carbon and oxygen atoms. When the oxygen atom attacks an electrophile, it is called O-attack, whereas electrophilic attack via the α carbon is known as...
2.1K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.4K
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.
8.4K
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

4.2K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
4.2K
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.
2.0K

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相关实验视频

Updated: Jun 29, 2025

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
19:58

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

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一种用于阴离子识别的二氧化-N-氧化.

Sean R Barlow1, Nathan R Halcovitch1, Nicholas H Evans1

  • 1Department of Chemistry, Lancaster University, Lancaster, LA1 4YB, UK. n.h.evans@lancaster.ac.uk.

Organic & biomolecular chemistry
|March 25, 2024
PubMed
概括

研究人员迅速合成了一种新型的pyridine-N-oxide [2]catenane. 这种分子显示了可逆质子和选择性离子结合的潜力,为超分子化学提供了新的途径.

科学领域:

  • 超分子化学 超分子化学
  • 有机合成 有机合成
  • 材料科学 材料科学 材料科学

背景情况:

  • 连锁体是具有独特性质的机械互锁的分子架构.
  • 胺-N-氧化物部分可以作为协调站点和键受体.
  • 开发高效的合成路径,以复杂的相互锁定分子仍然是一个挑战.

研究的目的:

  • 描述一种快速合成含有 [2]catenane.catenane 的pyridine-N-oxide 的方法.
  • 使用先进的分析技术来描述合成的 [2]catenane.
  • 为了研究 [2]catenane 的宿主-客房属性,特别是它的阴离子结合和质子化行为.

主要方法:

  • 皮里丁N-氧化物 [2]catenane.catenane 的快速合成.
  • 使用核磁共振 (NMR) 谱学和质谱学进行表征.
  • 用X射线确定单晶结构以进行精确的结构分析.
  • 质子 (1H) NMR定位实验,以研究离子结合和质子化.

主要成果:

  • 成功和快速的准备目标胺-N-氧化物 [2]catenane.catenane.
  • 通过NMR,质谱学和X射线晶体学进行完整的结构和组成确认.

更多相关视频

Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
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Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
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Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate

Published on: April 24, 2018

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

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  • 1H NMR定位数据表明 [2]catenane 的可逆质子.
  • [2]catenane证明了离子与离子的优先结合.

    • 结论:

    • 已经建立了一个简单的合成路径,以实现功能化的 [2]catenane.
    • 胺-N-氧化物 [2]catenane 呈现出有趣的超分子特性,包括pH响应性和选择性离子识别.
    • 这项工作为设计基于连锁架构的先进分子机器和传感器提供了基础.