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Related Concept Videos

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide...
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Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

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Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.       
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Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

Aldol Condensation with β-Diesters: Knoevenagel Condensation

2.9K
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.
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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

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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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Catalyst-Free Dynamic Covalent Knoevenagel/Hydrazide Condensation for Polyacylhydrazones and Covalent Adaptable

Pengyun Li1, Jingwen Zhang1, Zhiqiang Wang1

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P.R. China.

Angewandte Chemie (International Ed. in English)
|May 12, 2025
PubMed
Summary

We developed a new catalyst-free reaction for dynamic polymers. This method allows for tunable properties and efficient reprocessing of materials, expanding possibilities in polymer design.

Keywords:
Covalent adaptable networksDynamic covalent chemistryDynamic polymersKnoevenagel/hydrazide condensationPolyacylhydrazones

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Chemistry

Background:

  • Dynamic covalent chemistry (DCvC) is crucial for advanced materials.
  • There's a need for catalyst-free reactions with broad equilibrium constant (Keq) ranges for designing dynamic polymers.

Purpose of the Study:

  • To explore a new catalyst-free dynamic covalent condensation reaction.
  • To achieve a wide Keq range for tailored polymer synthesis.
  • To develop novel covalent adaptable networks (CANs).

Main Methods:

  • Investigated catalyst-free condensation between Knoevenagel derivatives (Kn) and hydrazides.
  • Conducted small-molecule studies to analyze substituent effects on Keq.
  • Synthesized high-molar-mass polyacylhydrazones and developed a CAN.

Main Results:

  • Discovered a wide Keq range (0.1-719) influenced by Kn substituents.
  • Achieved catalyst-free synthesis of polyacylhydrazones (up to 180 kDa) using high Keq values.
  • Demonstrated concentration-dependent topology switching and developed a CAN with rapid stress relaxation (38 s at 160 °C).

Conclusions:

  • The new condensation reaction offers a versatile tool for creating dynamic polymers.
  • The reaction enables efficient thermal reprocessing and maintains high mechanical performance in materials.
  • This work expands the scope of DCvC for advanced polymer design.