Related Experiment Video
Updated: Jun 14, 2026

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
Published on: November 15, 2017
Click chemistry under non-classical reaction conditions
C Oliver Kappe1, Erik Van der Eycken
1Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-8010 Graz, Austria. oliver.kappe@uni-graz.at
Click chemistry, including copper-catalyzed azide-alkyne cycloaddition (CuAAC), is vital in synthesis. This review highlights process intensification techniques like microwave heating and continuous flow for click reactions.
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
- Polymer Science
- Material Science
- Chemical Biology
Background:
- Click chemistry, exemplified by Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC), has become a cornerstone in various scientific disciplines.
- While typically conducted at ambient temperatures, certain applications necessitate enhanced reaction rates and efficiency.
Purpose of the Study:
- To provide a tutorial review for synthetic chemists on click chemistry.
- To highlight the application of non-classical reaction conditions for process intensification in click chemistry.
Main Methods:
- Review of existing literature on click chemistry under non-classical conditions.
- Focus on microwave heating and continuous flow processing techniques.
- Examples illustrating the benefits of process intensification.
Main Results:
- Demonstration of successful click reactions under microwave irradiation.
- Showcasing the efficacy of continuous flow systems for click chemistry.
- Highlighting improved reaction times and yields through intensified processes.
Conclusions:
- Process intensification using microwave heating and continuous flow offers significant advantages for click chemistry.
- These methods enable efficient synthesis in organic chemistry, medicinal chemistry, and materials science.
- The tutorial aims to guide synthetic chemists in adopting these advanced techniques.
Related Concept Videos
Free Energy Changes for Nonstandard States
Predicting Reaction Outcomes
Fast Reactions
Chemical Reactions
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
Chemical Reactions
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them into different...
Temperature Dependence on Reaction Rate
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...

