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Related Concept Videos

[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.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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.
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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

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

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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Updated: May 21, 2026

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library
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Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library

Published on: January 14, 2020

A rigid donor-acceptor daisy chain dimer.

Dennis Cao1, Cheng Wang, Marc A Giesener

  • 1Center for the Chemistry of Integrated Systems, Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.

Chemical Communications (Cambridge, England)
|June 2, 2012
PubMed
Summary
This summary is machine-generated.

A novel molecular assembly forms a [c2]daisy chain structure. This structure rapidly breaks apart and reforms above room temperature, offering insights into dynamic molecular systems.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Cyclobis(paraquat-p-phenylene) and tetrathiafulvalene are key components in supramolecular chemistry.
  • Understanding self-assembly and dynamic behavior of molecular components is crucial for developing advanced materials.

Purpose of the Study:

  • To investigate the self-assembly behavior of a functionalized cyclobis(paraquat-p-phenylene) linked to a tetrathiafulvalene unit.
  • To characterize the dynamic nature of the resulting supramolecular structure.

Main Methods:

  • Synthesis of a novel molecular construct linking cyclobis(paraquat-p-phenylene) and tetrathiafulvalene via a rigid linker.
  • Analysis of the self-assembly and dissociation dynamics using Nuclear Magnetic Resonance (NMR) spectroscopy, specifically (1)H NMR.

Main Results:

  • The functionalized components preferentially form a [c2]daisy chain supramolecular structure.
  • This daisy chain structure exhibits rapid dissociation and reassociation dynamics.
  • The observed dynamics are temperature-dependent, occurring on the NMR time-scale above room temperature.

Conclusions:

  • The rigid linker and the nature of the components prevent self-complexation and promote specific [c2]daisy chain formation.
  • The facile and rapid dynamic exchange of the daisy chain structure is a key characteristic.
  • This study provides a foundation for designing dynamic supramolecular architectures with tunable properties.