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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.5K
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...
3.5K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

12.0K
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.
12.0K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.3K
Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

1.5K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.5K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

5.3K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
5.3K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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

3.2K
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.
3.2K

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Related Experiment Video

Updated: Dec 20, 2025

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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A cyclic bis[2]catenane metallacage.

Yiliang Wang1, Yicheng Zhang1, Zhixuan Zhou2

  • 1School of Materials Science and Engineering, Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, Shanghai University, Shanghai, 200444, China.

Nature Communications
|June 3, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel cyclic bis[2]catenane, a complex molecular architecture, using coordination-driven self-assembly. This breakthrough in supramolecular chemistry offers new possibilities for responsive materials.

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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds
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Design, Synthesis, and Photochemical Properties of Clickable Caged Compounds

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Catenated cages are challenging synthetic targets due to the complexity of three-dimensional assembly.
  • The formation of interlocked molecular structures requires precise control over component interactions.

Purpose of the Study:

  • To construct a novel cyclic bis[2]catenane through coordination-driven self-assembly.
  • To investigate the responsive transformations of the synthesized molecular architecture.

Main Methods:

  • Coordination-driven self-assembly utilizing Pt(II) heteroligation.
  • Employing endo-functionalized double-bridged tweezers and tetra-carboxylated linkers.
  • Characterization using NMR spectrometry, X-ray crystallography, and mass spectrometry.

Main Results:

  • Successful synthesis of a cyclic bis[2]catenane with an "∞"-shaped topology.
  • Formation achieved via a 14-component self-assembly process.
  • Demonstrated reversible transformations between the bis[2]catenane and bis-metallacage triggered by guest exchange, concentration, and solvent effects.

Conclusions:

  • This study presents a novel cyclic cage-based [2]catenane oligomer.
  • The reversible responsiveness of the system opens avenues for designing dynamic molecular materials.
  • Highlights the power of coordination-driven self-assembly in creating complex supramolecular architectures.