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Related Concept Videos

Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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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.
4.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

4.0K
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...
4.0K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.4K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.4K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

4.9K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
4.9K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.8K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.8K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

9.3K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
9.3K

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Related Experiment Video

Updated: Mar 15, 2026

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Dirhodium-catalyzed C-H arene amination using hydroxylamines.

Mahesh P Paudyal1, Adeniyi Michael Adebesin1, Scott R Burt2

  • 1Division of Chemistry, Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

Science (New York, N.Y.)
|September 10, 2016
PubMed
Summary

This study introduces a new, mild dirhodium-catalyzed C-H amination method. It efficiently converts aromatic compounds into valuable arylamines using novel aminating agents.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Arylamines are crucial building blocks in pharmaceuticals, agrochemicals, and materials science.
  • Existing methods for direct arylamine synthesis often lack generality or require harsh conditions.

Purpose of the Study:

  • To develop a broadly applicable and mild method for direct C-H amination of aromatic compounds.
  • To synthesize primary and N-alkyl arylamines from diverse aromatic precursors.

Main Methods:

  • Utilized a dirhodium catalyst for C-H amination reactions.
  • Employed NH2/NH(alkyl)-O-(sulfonyl)hydroxylamines as novel aminating agents with an internal oxidant.
  • Applied the method to various monocyclic and fused aromatic systems.

Main Results:

  • Achieved direct conversion of aromatic C-H bonds to C-N bonds, forming arylamines.
  • Demonstrated moderate-to-good yields and good regioselectivity under mild, scalable conditions.
  • Successfully extended the methodology to synthesize fused N-heterocycles.

Conclusions:

  • Presented a versatile and efficient dirhodium-catalyzed C-H amination protocol.
  • The developed method offers a practical route to diverse arylamines and N-heterocycles.
  • This advancement addresses the need for accessible synthetic strategies in medicinal and materials chemistry.