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Related Concept Videos

C–C Bond Formation: Aldol Condensation Overview01:10

C–C Bond Formation: Aldol Condensation Overview

Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.
Aldol Condensation vs Claisen Condensation01:33

Aldol Condensation vs Claisen Condensation

Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral intermediate.
Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

Aldol Condensation with β-Diesters: Knoevenagel Condensation

The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
Acid-Catalyzed Aldol Addition Reaction01:15

Acid-Catalyzed Aldol Addition Reaction

The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.
[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.
Crossed Aldol Reactions: Overview01:04

Crossed Aldol Reactions: Overview

Crossed aldol addition is the reaction between two different carbonyl compounds under acidic or basic conditions. Here, both the carbonyl compounds function as nucleophiles and electrophiles. As shown in Figure 1, such a reaction yields a mixture of products, two of which are formed via self-condensation, while the remaining two are formed via crossed-condensation. Without adjustment, the reaction's usefulness in organic chemistry is decreased.

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Updated: May 22, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
07:02

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

Click-like Aldol Polycondensation in air for plastic electronics and beyond.

Hongru Chen1, Hongyuan Fu1, Xiaofan Shi1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China.

Nature Communications
|May 20, 2026
PubMed
Summary

Researchers developed a new air-tolerant polycondensation method for creating conjugated polymers. This efficient process enables rapid, modular assembly of advanced materials for plastic electronics.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Polyaromatic materials with extended C-C/C=C conjugation are crucial for next-generation plastic electronics.
  • Conventional C-C couplings often require oxygen-free conditions, limiting their operational simplicity.

Purpose of the Study:

  • To present a novel, efficient, and air-tolerant method for synthesizing conjugated polymers.
  • To establish a versatile platform for designing functional polyaromatic materials.

Main Methods:

  • A click-like C=C bond-forming Aldol polycondensation reaction.
  • An enolate-mediated mechanism within a dual-catalytic process.
  • Strategic control of heteroatom and ring geometry to modulate monomer reactivity.

Main Results:

  • The polycondensation proceeds with high efficiency and operational simplicity in air.
  • In situ-generated acetic acid enhances reactant oxidation potential, enabling air-tolerant operation.
  • Rapid (typically within 30 min) and modular assembly of multidimensional conjugated polymers is achieved.

Conclusions:

  • This methodology provides a design roadmap and a versatile toolbox for tailored functionality in conjugated polymers.
  • The developed approach offers transformative potential for emerging plastic electronics and other applications.