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Related Concept Videos

Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

5.0K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

5.1K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
5.1K
Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

7.4K
Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
7.4K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.9K
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.9K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

4.3K
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
4.3K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

4.3K
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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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
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Flow Chemistry as an Enabling Technology for Process-Intensified Amination Reactions: A Decadal Review.

Feng Zhou1, Yijun Zhou1, Pan Wang1

  • 1National & Local Joint Engineering Research Center for Deep Utilization Technology of Rock-Salt Resource, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huai'an 223003, China.

Molecules (Basel, Switzerland)
|April 14, 2026
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Summary

Flow chemistry offers efficient and scalable amine synthesis, overcoming batch process limitations. This review highlights advances in continuous-flow amination for pharmaceuticals and materials science.

Keywords:
aminationflow chemistrymicroreactorprocess intensification

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Area of Science:

  • Organic Chemistry
  • Chemical Engineering
  • Process Intensification

Background:

  • Amines are crucial in pharmaceuticals, agrochemicals, and materials.
  • Traditional batch synthesis methods for amines face challenges in mixing, heat/mass transfer, safety, and scalability.
  • Flow chemistry presents a promising alternative for enhanced amine synthesis.

Purpose of the Study:

  • To systematically review advances in flow chemistry for amination reactions since 2015.
  • To analyze various enabling scenarios in continuous-flow amination through the lens of process intensification.
  • To guide researchers in developing more efficient, sustainable, and scalable flow-based amination processes.

Main Methods:

  • Review of literature on flow chemistry for amination reactions from 2015 onwards.
  • Analysis of diverse amination scenarios including heterogeneous, thermally activated, and enzymatic methods.
  • Examination of novel continuous-flow process development and reaction kinetics studies.

Main Results:

  • Flow chemistry provides enhanced transport properties, precise control, and improved safety for amine synthesis.
  • Significant progress has been made in various continuous-flow amination strategies.
  • Flow chemistry enables the study of reaction kinetics for process optimization.

Conclusions:

  • Flow chemistry is a powerful technology for intensifying amine synthesis.
  • Recent advances demonstrate its potential for efficient, sustainable, and scalable production.
  • This review serves as a reference for future development in continuous-flow amination.