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Related Concept Videos

Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
3.9K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

3.9K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
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Continuous-Flow Microreactor System for Enhanced Selectivity and Safety in Nitrobenzene Nitration.

Wenyuan Zhao1, Simeng Wang2, Wenxian Zhao3

  • 1Shenyang University of Chemical Technology, Shenyang 110142, China.

ACS Omega
|April 28, 2025
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Summary

This study introduces a continuous-flow microreactor for safer, more selective dinitrobenzene synthesis. The microreactor system significantly reduces hazardous byproducts compared to traditional batch methods.

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Area of Science:

  • Chemical Engineering
  • Organic Synthesis
  • Process Chemistry

Background:

  • Dinitrobenzene is a key intermediate for pesticides and dyes.
  • Traditional synthesis involves exothermic nitration of nitrobenzene, posing safety and selectivity challenges.
  • Batch processes often result in significant hazardous byproduct formation.

Purpose of the Study:

  • To develop and evaluate a continuous-flow microreactor system for enhanced dinitrobenzene synthesis.
  • To improve selectivity towards desired products and minimize hazardous byproducts.
  • To enhance safety in the nitration of nitrobenzene.

Main Methods:

  • Utilized a continuous-flow microreactor system with integrated micromixers.
  • Developed an open-source Python program for precise control of reactant flow rates.
  • Optimized reaction conditions and employed sodium dodecyl sulfate (SDS) as a surfactant.

Main Results:

  • Achieved minimized p-dinitrobenzene selectivity of 0.44%.
  • Reduced hazardous nitrophenol byproducts to 112 ppm, a significant decrease from 509 ppm in batch processes.
  • Demonstrated substantial reduction in nitrophenol and trinitrobenzene formation compared to batch reactors.

Conclusions:

  • The continuous-flow microreactor system offers enhanced selectivity and safety for dinitrobenzene production.
  • The developed system shows significant advantages over traditional batch processes for industrial-scale applications.
  • Microreactor technology provides a viable solution for safer and more efficient chemical synthesis.