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Related Concept Videos

Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Updated: Sep 22, 2025

Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
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Diselenide-Linked Polymers under Sonication.

Qin Wu1, Yuan Yuan1, Feiyi Chen1

  • 1Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, Tianjin University, Tianjin 300354, P. R. China.

ACS Macro Letters
|May 26, 2022
PubMed
Summary
This summary is machine-generated.

Pulse sonication breaks selenium-selenium bonds in polymers, enabling selective reactions. This sonochemistry of diselenide polymers offers a new method for dynamic covalent chemistry applications.

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Area of Science:

  • Polymer Chemistry
  • Sonochemistry
  • Materials Science

Background:

  • Diselenide bonds (Se-Se) are dynamic covalent bonds responsive to various stimuli.
  • Understanding stimuli-responsive polymer behavior is crucial for advanced materials development.

Purpose of the Study:

  • To investigate the effect of pulse sonication on Se-Se-linked polystyrenes.
  • To compare sonication with other stimuli (heat, light) for Se-Se bond metathesis.
  • To explore sonication as a method for selective polymer modification.

Main Methods:

  • Synthesis of Se-Se-linked polystyrenes.
  • Pulse sonication treatment.
  • Gel Permeation Chromatography (GPC) for molecular weight analysis.
  • Derivatization experiments.
  • Electron Paramagnetic Resonance (EPR) spectroscopy for radical detection.

Main Results:

  • Sonication successfully induced bond scission and metathesis in the polymeric diselenides.
  • Kinetics and energy conversion efficiency of sonication were compared with heating and light.
  • Sonication demonstrated potential as an alternative stimulus for breaking Se-Se bonds.
  • Selective metathesis reactions between polymers and small molecules were achieved using sonication.

Conclusions:

  • Sonication is an effective method for cleaving Se-Se bonds in polymers.
  • This study expands the understanding of diselenide chemistry and polymer mechanochemistry.
  • Sonochemistry offers a novel approach for dynamic covalent polymer applications.