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Related Concept Videos

Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

6.0K
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.
6.0K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.7K
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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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

5.6K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
5.6K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

4.6K
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...
4.6K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Electrophilic Aromatic Substitution: Sulfonation of Benzene01:22

Electrophilic Aromatic Substitution: Sulfonation of Benzene

6.1K
Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.
6.1K

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Recent Progress Toward Electrocatalytic Conversion of Nitrobenzene.

Shaojun Zhu1, Zheng-Jun Wang1, Yihuang Chen1

  • 1Wenzhou Key Lab of Advanced Energy Storage and Conversion, Zhejiang Province Key Lab of Leather Engineering, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, 325035, China.

Small Methods
|December 13, 2023
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Summary

This review explores advanced catalysts for electrocatalytic nitrobenzene reduction (eNBRR). It highlights how catalyst structure influences performance and proposes future research directions for industrialization.

Keywords:
anilineazobenzenecatalyst designelectrocatalytic nitrobenzene reduction reactionreaction pathway

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrocatalytic nitrobenzene reduction (eNBRR) is crucial, but catalyst design is hindered by poor structure-performance understanding.
  • Optimizing eNBRR requires a deep understanding of how catalyst properties affect reaction pathways and efficiency.

Purpose of the Study:

  • To analyze the electrocatalytic nitrobenzene reduction pathway and key influencing factors.
  • To summarize recent advancements in catalyst design for eNBRR.
  • To propose future research directions for eNBRR.

Main Methods:

  • Analysis of the eNBRR reaction mechanism and influential factors (electrolyte, potential, catalyst structure).
  • Comprehensive review of recent catalyst design strategies focusing on composition, morphology, and crystal facets.
  • Identification of research gaps and future opportunities in eNBRR.

Main Results:

  • Catalyst structure, including chemical composition, morphology, and crystal facets, significantly impacts the local microenvironment, electron, and mass transport.
  • Understanding these structure-property relationships is key to boosting eNBRR catalytic performance.
  • Key factors influencing eNBRR include electrolyte properties, applied potential, and catalyst architecture.

Conclusions:

  • Bridging the knowledge gap between catalyst structure and eNBRR performance is essential for progress.
  • Future research should focus on performance enhancement, product scope expansion, mechanistic understanding, and industrialization.
  • Integrating upstream and downstream technologies is vital for accelerating the industrial application of eNBRR.