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Preparation of Amides01:29

Preparation of Amides

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
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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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Preparation of 1° Amines: Gabriel Synthesis01:28

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
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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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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Preparation of 1° Amines: Azide Synthesis01:22

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Tailored thiol-functional polyamides: synthesis and functionalization.

Stefan Mommer1, Helmut Keul, Martin Möller

  • 1DWI - Leibniz-Institute for Interactive Materials, Forckenbeckstr. 50, D-52056, Aachen, Germany.

Macromolecular Rapid Communications
|September 27, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create functional polyamides. This process yields water-soluble, amphiphilic polyamides with tunable properties by modifying pendant thiol groups.

Keywords:
Michael additionpolyamidespostpolymerization modificationthermal propertiesthiols

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Polyamides are versatile polymers with broad applications.
  • Functionalization of polyamides allows for tailored material properties.
  • Developing efficient synthetic routes for functional polyamides remains an active research area.

Purpose of the Study:

  • To describe a novel synthetic strategy for preparing polyamides with functional side groups.
  • To explore the synthesis of a bis(thiolactone) monomer and its subsequent polymerization.
  • To demonstrate the functionalization of resulting polyamides to achieve water-soluble, amphiphilic characteristics.

Main Methods:

  • Synthesis of a bis(thiolactone) monomer from itaconic acid and DL-homocysteine thiolactone.
  • Polymerization of the bis(thiolactone) monomer with diamine comonomers (A,A-B,B polymerization).
  • Post-polymerization functionalization of pendant thiol groups via Michael addition with acrylates, including poly(ethylene glycol) monomethyl ether (mPEG) acrylates.

Main Results:

  • Successful synthesis of a bis(thiolactone) monomer in three steps.
  • Formation of polyamides with pendant thiol groups through ring-opening polymerization.
  • Tuning of polyamide properties (thermal, molecular weight) by varying diamine ratios.
  • Creation of water-soluble amphiphilic polyamides with high molecular weights (>10,000 g mol⁻¹) via mPEG functionalization.

Conclusions:

  • A versatile synthetic route for functional polyamides has been established.
  • The method allows for precise control over polymer architecture and properties.
  • The resulting water-soluble amphiphilic polyamides hold potential for various applications requiring tailored solubility and surface activity.