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Related Concept Videos

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Covalent Bonds01:29

Covalent Bonds

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Covalent Bonds01:08

Covalent Bonds

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When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Related Experiment Video

Updated: Feb 16, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Surface-Confined Dynamic Covalent System Driven by Olefin Metathesis.

Chunhua Liu1,2,3, Eunsol Park2, Yinghua Jin2

  • 1Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300072, P. R. China.

Angewandte Chemie (International Ed. in English)
|December 31, 2017
PubMed
Summary

Dynamic combinatorial libraries (DCLs) adapt differently on surfaces versus in solution. Scanning tunneling microscopy reveals how environmental factors influence surface-confined olefin metathesis and polymer assembly.

Keywords:
dynamic covalent chemistryinterfacesolefin metathesisscanning tunneling microscopysurface chemistry

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Supramolecular Chemistry

Background:

  • Understanding dynamic combinatorial libraries (DCLs) is crucial for designing adaptive materials.
  • The behavior of DCLs in bulk solution differs significantly from their behavior on surfaces.
  • Surface-confined reactions offer unique opportunities for material design and synthesis.

Purpose of the Study:

  • To investigate the constitutional dynamics of DCLs adapting to surfaces.
  • To elucidate the mechanisms of surface-confined olefin metathesis.
  • To explore the formation and assembly of polymers and oligomers on surfaces.

Main Methods:

  • Submolecularly resolved scanning tunneling microscopy (STM) was employed to analyze reactions at the interface.
  • Analysis of product distribution under varying conditions provided insights into reaction pathways.
  • Controlled deposition and assembly studies were performed on surfaces.

Main Results:

  • Environmental pressure, reaction temperature, and substituent effects significantly influence surface-confined olefin metathesis.
  • An unprecedented preferred deposition and assembly of linear polymers and specific oligomers were observed on the surface.
  • These surface-confined assemblies are difficult to achieve through conventional methods.

Conclusions:

  • Surface confinement profoundly impacts the constitutional dynamics and reactivity of DCLs.
  • STM is a powerful tool for studying interfacial reactions at the submolecular level.
  • The findings enable the rational design of adaptive materials with controlled polymer architectures through surface-confined synthesis.