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Related Concept Videos

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.2K
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,...
2.2K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.1K
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...
3.1K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.9K
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.
2.9K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.1K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
3.1K

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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Easily Functionalized and Readable Sequence-Defined Polytriazoles.

Xueyan Zhang1, Fuqi Gou1, Xiaojun Wang1

  • 1State Key Laboratory of Organic-Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Macro Letters
|May 16, 2022
PubMed
Summary

Researchers developed a novel sequence-defined polytriazole structure using iterative azidation and iridium-catalyzed cycloaddition (IrAAC). This new polymer architecture allows for diverse side-chain functionalization and shows potential in digital polymer development and functional materials.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Developing sequence-defined polymers with tunable side groups is a significant challenge in polymer chemistry.
  • Existing methods often lack efficiency or versatility in introducing diverse functionalities.

Purpose of the Study:

  • To report a novel sequence-defined polytriazole structure with side groups attached to the triazole rings.
  • To demonstrate a facile and versatile method for constructing such polymers.

Main Methods:

  • Iterative azidation and iridium-catalyzed cycloaddition of azide with internal 1-thioalkyne (IrAAC) in solution phase.
  • Preparation of 1-thioalkyne monomers for diverse side-chain introduction.
  • Characterization using tandem mass spectrometry.

Main Results:

  • Successful synthesis of a sequence-defined polytriazole with side groups on the triazole rings.
  • Demonstrated facile introduction of diverse functional side chains due to the tolerance of IrAAC.
  • Effective characterization via tandem mass spectrometry, showing backbone bond cleavage.
  • Built monodisperse macromolecules with aggregation-induced emission (AIE) characteristics.

Conclusions:

  • The developed IrAAC-based method provides a facile route to sequence-defined polytriazoles with tunable side groups.
  • The polymer structure is amenable to characterization and shows promise for high-capacity digital polymer applications.
  • The successful fabrication of AIE-active macromolecules highlights its potential in advanced functional materials.