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Preparation of Nitriles01:12

Preparation of Nitriles

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

1.9K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.9K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.3K
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...
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Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...
3.0K
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.
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Electrochemical C-H Sulfonylation of N,N-Dialkylanilines: Sequential Dehydrogenative Cross-Coupling and

Yeseul Park1, Sunwoo Lee1

  • 1Department of Chemistry, Chonnam National University, Gwangju 61186, Republic of Korea.

The Journal of Organic Chemistry
|June 12, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces an electrochemical method for direct sulfonylation of aniline derivatives using sulfonyl hydrazides. The process offers an efficient, one-pot synthesis of complex sulfonylated compounds without transition metals.

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Area of Science:

  • Organic Chemistry
  • Electrochemistry
  • Synthetic Methodology

Background:

  • Sulfonylation of aniline derivatives is crucial for synthesizing various organic compounds.
  • Existing methods often require harsh conditions or transition metal catalysts.
  • Direct C-H functionalization offers a more sustainable synthetic approach.

Purpose of the Study:

  • To develop a novel electrochemical method for direct sulfonylation of N,N-dialkylaniline derivatives.
  • To achieve one-pot synthesis of N,N,N',N'-tetramethyl-3-arylsulfonyl-[1,1'-biphenyl]-4,4'-diamine derivatives.
  • To introduce arylsulfonyl groups at the ortho position of N,N-dialkylanilines.

Main Methods:

  • Electrochemical direct sulfonylation using sulfonyl hydrazides.
  • Sequential dehydrogenative cross-coupling and C-H-activated sulfonylation.
  • Optimization of reaction conditions: acetonitrile solvent, carbon anode, nickel cathode, n-Bu4NBF4 electrolyte.

Main Results:

  • Successful one-pot synthesis of N,N,N',N'-tetramethyl-3-arylsulfonyl-[1,1'-biphenyl]-4,4'-diamine derivatives.
  • Efficient ortho-sulfonylation of various N,N-dialkylanilines.
  • High yields achieved across a broad range of substrates.

Conclusions:

  • The developed electrochemical method provides an efficient and versatile route to sulfonylated aniline derivatives.
  • The method avoids the need for transition metal catalysts and external oxidants.
  • This approach offers a sustainable alternative for synthesizing valuable organic intermediates.