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Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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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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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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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.
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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Preparation of 1° Amines: Azide Synthesis01:22

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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.
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Related Experiment Video

Updated: Nov 2, 2025

Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles PPAs and Related Biomaterials
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A versatile living polymerization method for aromatic amides.

Subhajit Pal1, Dinh Phuong Trinh Nguyen1, Angélique Molliet1

  • 1Department of Chemistry, University of Fribourg, Fribourg, Switzerland.

Nature Chemistry
|June 9, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed novel chlorophosphonium iodide reagents to achieve living polymerization of aromatic amino acids. This breakthrough enables controlled synthesis of complex polymer architectures, including block copolymers, with enhanced stability and functional group tolerance.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis

Background:

  • Conventional polycondensation polymers follow step-growth kinetics.
  • Living polymerization requires selective acceleration of reaction rates at the chain end.

Purpose of the Study:

  • To develop novel reagents for living polymerization of aromatic amino acids.
  • To enable controlled synthesis of complex polymer architectures.

Main Methods:

  • Synthesis of two chlorophosphonium iodide reagents from triphenylphosphine and tri(o-methoxyphenyl)phosphine.
  • Activation of aromatic carboxylic acids to form activated monomers.
  • Living polymerization of p-aminobenzoic acid derivatives and other aryl amino acids using amine initiators.

Main Results:

  • Developed reagents that activate aromatic carboxylic acids for polymerization.
  • Achieved living polymerization of p-aminobenzoic acid derivatives and other aryl amino acids.
  • Successfully synthesized diblock copolymers and triblock terpolymers with functional group tolerance.

Conclusions:

  • The novel phosphonium reagents facilitate living polymerization of aryl amino acids.
  • This method allows for the controlled synthesis of complex polymer structures.
  • The approach offers potential for creating advanced polymeric materials with tailored properties.