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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

4.2K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Batch vs Continuous Culture01:14

Batch vs Continuous Culture

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Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...
191
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Related Experiment Video

Updated: Apr 19, 2026

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

Published on: November 15, 2017

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Diazo compounds in continuous-flow technology.

Simon T R Müller1, Thomas Wirth

  • 1School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT (UK).

Chemsuschem
|December 10, 2014
PubMed
Summary
This summary is machine-generated.

Continuous flow technology makes hazardous diazo compounds safer for large-scale organic synthesis. This approach enables in situ generation and consumption, improving safety and efficiency in chemical manufacturing.

Keywords:
continuous flowdiazo compoundsgreen chemistrymicroreactorsmultistep synthesis

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Area of Science:

  • Organic Chemistry
  • Chemical Engineering
  • Process Safety

Background:

  • Diazo compounds are versatile organic synthesis reagents due to their clean and atom-efficient dinitrogen leaving group.
  • However, their inherent explosive nature poses significant challenges for safe industrial-scale handling.
  • Traditional batch processes struggle with the safe management of these reactive intermediates.

Purpose of the Study:

  • To review the application of continuous flow technology for the safe and scalable use of diazo compounds.
  • To highlight advancements in handling hazardous diazo reagents like diazomethane and ethyl diazoacetate.
  • To emphasize the potential for large-scale industrial applications of flow chemistry with diazo compounds.

Main Methods:

  • Utilizing microstructured devices for enhanced heat transfer and safe reagent handling.
  • Implementing in situ formation and immediate consumption of diazo compounds.
  • Reviewing specific methodologies for diazomethane and ethyl diazoacetate in flow systems.

Main Results:

  • Continuous flow technology significantly mitigates the risks associated with explosive diazo compounds.
  • Microreactors provide superior control over reaction parameters, enabling safer handling.
  • In situ generation/consumption strategies streamline processes and improve safety profiles.
  • Demonstrated feasibility for scaling up reactions involving hazardous diazo intermediates.

Conclusions:

  • Continuous flow chemistry offers a viable solution for the industrial-scale application of diazo compounds.
  • Microstructured reactors are key to managing the safety and efficiency of these powerful reagents.
  • This technology unlocks broader applications for diazo chemistry in large-scale synthesis.