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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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.
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.
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
[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.
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.

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Related Experiment Video

Updated: May 29, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
09:12

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Published on: June 1, 2016

Cycloaddition reactions: a controlled approach for carbon nanotube functionalization.

Indresh Kumar1, Sravendra Rana, Jae Whan Cho

  • 1Department of Textile Engineering, Konkuk University, Seoul 143-701, Korea.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 2, 2011
PubMed
Summary

Cycloaddition reactions enable controlled functionalization of carbon nanotubes (CNTs). This method allows diverse molecules to attach to CNTs, creating advanced hybrid materials for nanobiotechnology and nanoelectronics.

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Preparation of Carbon Nanosheets at Room Temperature
10:44

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Published on: March 8, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Chemistry

Background:

  • Carbon nanotubes (CNTs) possess unique properties but require controlled surface functionalization for advanced applications.
  • Existing functionalization methods can disrupt CNT structure or lead to non-uniform group distribution.

Purpose of the Study:

  • To describe a method for controlled functionalization of carbon nanotubes using cycloaddition reactions.
  • To demonstrate the versatility of cycloaddition for attaching a wide range of molecules to CNTs.
  • To highlight the potential of the resulting CNT-based hybrid materials.

Main Methods:

  • Utilizing various cycloaddition reactions to functionalize carbon nanotubes.
  • Characterizing the functionalized CNTs to confirm structural integrity and functional group distribution.

Main Results:

  • Successful attachment of diverse molecules onto CNT surfaces via cycloaddition.
  • Preservation of the structural integrity of the carbon nanotubes.
  • Achieved a statistical distribution of functional groups across the CNT surface.

Conclusions:

  • Cycloaddition reactions provide an effective and precise approach for CNT functionalization.
  • The developed method yields CNT-based hybrid materials suitable for nanobiotechnology and nanoelectronics.
  • This tailored functionalization opens avenues for novel material design and applications.