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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.
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
2.8K
[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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Related Experiment Video

Updated: Jan 11, 2026

Synthesis, Cellular Delivery and In vivo Application of Dendrimer-based pH Sensors
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Cyclophane-Based Dendrimers: Today and Tomorrow.

Olga Mostovaya1, Alena Vavilova1, Asiya Gazizova1

  • 1A.M. Butlerov Chemical Institute, Kazan Federal University, Kremlevskaya St., 18, 420008 Kazan, Russia.

Molecules (Basel, Switzerland)
|November 13, 2025
PubMed
Summary

Macrocyclic dendrimers, synthesized using cyclophanes, offer a cost-effective and less toxic alternative to traditional dendrimers. These novel compounds exhibit unique properties for diverse applications.

Keywords:
(thia)calixarenesapplicationdendrimersdrug deliverypillararenesresorcinarenessynthesis

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Dendrimers are highly branched macromolecules with broad applications in medicine, catalysis, and electronics.
  • Traditional dendrimer synthesis is expensive, purification is challenging, and they often exhibit high toxicity.
  • Toxicity is linked to dendrimer generation and terminal groups, with structural modification often used to mitigate it.

Purpose of the Study:

  • To review the synthesis and properties of dendrimers constructed from macrocyclic compounds (cyclophanes).
  • To highlight the advantages of macrocyclic dendrimers over traditional ones.
  • To explore the potential applications of these novel dendrimers.

Main Methods:

  • Discussion of synthetic strategies for creating dendrimers based on pillararenes, resorcinarenes, and (thia)calixarenes.
  • Analysis of the properties imparted by the macrocyclic platform, such as hydrophobicity and substrate encapsulation.
  • Exploration of amphiphilic and chiral characteristics of these hybrid structures.

Main Results:

  • Macrocyclic dendrimers are easier to prepare than traditional dendrimers.
  • The hydrophobic macrocyclic platform provides enhanced substrate encapsulation capabilities.
  • These dendrimers possess desirable amphiphilic and chiral properties.

Conclusions:

  • Macrocyclic dendrimers offer a promising alternative to traditional dendrimers due to simplified synthesis and unique properties.
  • Their amphiphilic and chiral nature, along with encapsulation abilities, opens new avenues for applications.
  • Potential applications span medicine, sensorics, catalysis, and alternative energy sources.