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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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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.
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...
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Covalent Bonds

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Atoms participate in a chemical bond formation to acquire a completed valence-shell electron configuration similar to that of the noble gas nearest to it in atomic number. Ionic, covalent, and metallic bonds are some of the important types of chemical bonds. Bond energy and bond length determine the strength of a chemical bond.
Types of Chemical Bonds
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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Dynamic covalent chemistry with azines.

Anca-Elena Dascalu1, Lau Halgreen1, Aaron Torres-Huerta1

  • 1Université libre de Bruxelles (ULB), Ecole polytechnique de Bruxelles, Engineering Molecular NanoSystems, Avenue Franklin Roosevelt 50, 1050, Brussels, Belgium. hennie.valkenier@ulb.be.

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New azines offer stable, yet exchangeable, building blocks for dynamic covalent chemistry. These functional groups are water-stable and form libraries that quickly reach equilibrium.

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Area of Science:

  • Organic Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Dynamic covalent chemistry (DCC) enables adaptable materials by reversibly forming covalent bonds.
  • Existing DCC methods like imines and acylhydrazones have limitations in stability or exchange rates.

Purpose of the Study:

  • To introduce azines as a novel dynamic covalent functional group.
  • To evaluate the stability and dynamic behavior of azines in solution.

Main Methods:

  • Synthesis and characterization of azine compounds.
  • Investigation of azine stability in aqueous conditions.
  • Formation and monitoring of dynamic combinatorial libraries (DCLs) using azines and aldehydes.

Main Results:

  • Azines demonstrate robust stability in the presence of water.
  • Dynamic combinatorial libraries composed of azines and aldehydes achieve equilibrium in under one hour.
  • Azines combine the stability of covalent bonds with the adaptability of reversible exchange.

Conclusions:

  • Azines represent a promising new functional group for dynamic covalent chemistry.
  • The rapid equilibration and water stability of azines facilitate their use in various applications.
  • Azines offer a versatile platform for designing adaptive and responsive materials.