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

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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...
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
9.6K
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5.2K
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...
5.2K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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3.9K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.9K
Nitrosation of Enols01:19

Nitrosation of Enols

10.1K
The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
10.1K

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Updated: Feb 26, 2026

A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
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Co-catalyzed highly selective C(sp3)-H nitration.

Yao Zhou1, Zhonghe Tang, Qiuling Song

  • 1Institute of Next Generation Matter Transformation, College of Chemical Engineering at Huaqiao University, 668 Jimei Blvd, Xiamen, Fujian 361021, P. R. China. qsong@hqu.edu.cn.

Chemical Communications (Cambridge, England)
|July 20, 2017
PubMed
Summary
This summary is machine-generated.

A new cobalt-catalyzed method enables selective nitration of aliphatic C(sp³)-H bonds, yielding diverse nitro compounds. This radical process avoids nitrating aromatic C(sp²)-H bonds, offering a novel synthetic route.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Selective functionalization of C-H bonds is a key challenge in organic synthesis.
  • Aliphatic C(sp³)-H nitration remains less developed compared to aromatic C(sp²)-H nitration.

Purpose of the Study:

  • To develop a novel, highly chemo- and regio-selective method for nitrating aliphatic C(sp³)-H bonds.
  • To utilize tert-butyl nitrite (t-BuONO) as an efficient nitrating reagent.

Main Methods:

  • Cobalt-catalyzed reaction system.
  • Employing tert-butyl nitrite (t-BuONO) as the nitrating agent.
  • Utilizing a radical process mechanism.

Main Results:

  • Achieved highly chemo- and regio-selective nitration of C(sp³)-H bonds.
  • Synthesized a diverse range of aliphatic nitro compounds in good yields.
  • Demonstrated selectivity for C(sp³)-H over C(sp²)-H nitration.

Conclusions:

  • The developed Co-catalyzed method provides an effective route for aliphatic C(sp³)-H nitration.
  • The radical pathway offers a distinct advantage over traditional methods, enabling selective functionalization.
  • This work expands the toolbox for synthesizing valuable aliphatic nitro compounds.