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

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

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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.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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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.
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Related Experiment Video

Updated: Jan 9, 2026

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

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Tailoring a 3D Covalent Organic Framework Toward Facile Functionalization.

Silas O Frimpong1, Maxima Pacheco1, Haomiao Xie2

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|December 8, 2025
PubMed
Summary

Researchers developed a new method to easily functionalize three-dimensional covalent organic frameworks (3D COFs). This strategy creates new COF materials with enhanced CO2 and PFAS adsorption capabilities.

Keywords:
COF‐300covalent organic frameworkslinkage functionalizationmicrocrystal electron diffraction (microED)post‐synthetic modification

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Last Updated: Jan 9, 2026

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Three-dimensional covalent organic frameworks (3D COFs) are crystalline and stable materials.
  • Functionalizing 3D COFs is challenging due to their intricate architectures and monomer structures.

Purpose of the Study:

  • To develop a facile post-synthetic functionalization strategy for imine-linked 3D COFs, specifically COF-300.
  • To create novel COF derivatives with diverse functionalities for tailored applications.

Main Methods:

  • Post-synthetic modification of imine linkages in COF-300 to secondary amines, followed by reaction with acetyl halides.
  • Characterization using solid-state NMR, infrared spectroscopy, powder X-ray diffraction, and microcrystal electron diffraction (microED).

Main Results:

  • Successfully synthesized eight new COF-300 derivatives with various appended groups (e.g., chloroacetyl, azide, amino).
  • Confirmed complete conversion of imine linkages to secondary amines while preserving framework crystallinity.
  • Solved the evacuated structure of COF-300-AR and the structure of COF-300-NH2, revealing a guest-induced phase change.

Conclusions:

  • The presented strategy enables facile functionalization of 3D COFs.
  • The new COF-300-NH2 derivative exhibits significantly enhanced adsorption capacity for CO2 and PFAS.
  • This approach is beneficial for designing customized adsorbent materials.