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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
[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.
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...

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Related Experiment Video

Updated: May 16, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

Host-Guest Complexation through Geometric Self-Optimization in [12]Cycloparaphenylene.

Manabu Hoshino1, Yoshiki Ohgo1

  • 1Graduate School of Medicine, and General Medical Education and Research Center, Teikyo University, 2-11-1, Itabashi-ku, Tokyo 173-8605, Japan.

Journal of the American Chemical Society
|May 14, 2026
PubMed
Summary

[12]cycloparaphenylene ([12]CPP) forms inclusion complexes via geometric self-optimization, not attractive forces. This mechanism allows accommodation of guests with minimal interaction, enabling new host-guest chemistry applications.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Published on: August 23, 2018

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Area of Science:

  • Supramolecular Chemistry
  • Host-Guest Chemistry
  • Organic Chemistry

Background:

  • Host-guest chemistry traditionally relies on noncovalent attractive interactions.
  • The cavity of host molecules must be accessible for guest inclusion.
  • Limited understanding exists for host-guest complex formation without strong attractive forces.

Purpose of the Study:

  • To demonstrate a new mechanism of host-guest complex formation in [12]cycloparaphenylene ([12]CPP).
  • To investigate the role of geometric self-optimization in host-guest chemistry.
  • To explore the potential of this mechanism for analyzing molecules in liquid states.

Main Methods:

  • Synthesis and complexation of [12]cycloparaphenylene ([12]CPP) with various guest molecules.
  • Single-crystal X-ray structure analysis to determine complex structures.
  • Structural evaluation of intermediate states during guest incorporation.

Main Results:

  • [12]cycloparaphenylene ([12]CPP) forms inclusion complexes through geometric self-optimization, not attractive noncovalent interactions.
  • Guest molecules with negligible solution interactions or hindered access were successfully accommodated.
  • The mechanism facilitates spontaneous crystallization of liquid compounds for structural analysis.

Conclusions:

  • Geometric self-optimization is a novel principle in host-guest chemistry.
  • This mechanism expands the scope of molecular inclusion beyond conventional attractive interactions.
  • The findings offer new possibilities for determining structures and absolute configurations of liquid molecules.