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Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

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Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
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Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

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Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Preparation of Amides01:29

Preparation of Amides

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

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The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Catalyst-Driven Improvements in Conventional Methods for Imine-Linked Covalent Organic Frameworks.

Maziar Jafari1, Zhiyuan Peng2, Ali Samie3

  • 1Department of Chemistry, University of Quebec at Montreal, Montreal, QC H3C 3P8, Canada.

Molecules (Basel, Switzerland)
|July 30, 2025
PubMed
Summary

Catalytic methods accelerate the synthesis of imine-linked covalent organic frameworks (COFs) by reducing reaction times and improving conditions. This review compares catalytic and conventional approaches for developing high-performance COFs.

Keywords:
COFscatalystcovalent organic frameworkspolymersporous materials

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Nanotechnology

Background:

  • Imine-linked covalent organic frameworks (COFs) are advanced crystalline materials known for strong, reversible covalent bonds.
  • Their structural integrity and defect correction during crystallization depend on sufficient reaction time.
  • Traditional synthesis methods often require harsh conditions and long durations, limiting scalability and sustainability.

Purpose of the Study:

  • To critically review and compare advancements in synthetic strategies for imine-linked COFs.
  • To focus on the advantages of catalytic versus conventional synthesis approaches.
  • To elucidate the impact of reaction conditions and time on COF properties like crystallinity and porosity.

Main Methods:

  • Comparative analysis of catalytic and conventional synthesis routes for imine-linked COFs.
  • Examination of reaction conditions, reaction times, yields, and resulting material properties.
  • Literature review of recent developments in COF synthesis methodologies.

Main Results:

  • Catalytic approaches offer significantly shorter reaction times and milder conditions compared to traditional methods.
  • These optimized conditions lead to improved yields and potentially enhanced crystallinity and porosity in COFs.
  • Conventional methods, while established, face limitations in scalability and environmental impact due to harsh conditions.

Conclusions:

  • Catalytic synthesis represents a more efficient and sustainable pathway for producing high-performance imine-linked COFs.
  • Understanding the trade-offs between synthesis methods is crucial for optimizing COF development.
  • Further research into catalytic strategies can unlock the full potential of these versatile materials.