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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

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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: 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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Preparation of Epoxides03:00

Preparation of Epoxides

10.0K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

13.8K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Related Experiment Video

Updated: Apr 18, 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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Olefin Metathesis Catalyzed by a Latent Ruthenathiete Complex.

Alec B Pabarue1, Tianqi Zhang1, Mizhi Xu1

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Organometallics
|April 17, 2026
PubMed
Summary

Researchers developed a novel four-membered sulfur-chelated ruthenium complex for olefin metathesis. This ruthenathiete complex shows light or heat-activated reactivity, offering new possibilities for controlled chemical transformations.

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Last Updated: Apr 18, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Four-membered chelate complexes of ruthenium are exceptionally rare in scientific literature.
  • Ruthenium complexes are widely used as catalysts in various organic reactions, including olefin metathesis.

Purpose of the Study:

  • To synthesize and characterize the first four-membered sulfur chelate of ruthenium.
  • To investigate the catalytic activity and latency of this novel ruthenathiete complex in olefin metathesis reactions.
  • To explore the structural factors contributing to the complex's stability and reactivity.

Main Methods:

  • Synthesis of a cis-dichloro ruthenathiete complex.
  • Benchmarking reactivity in ring-closing metathesis, cross-metathesis, and ring-opening metathesis polymerization.
  • Solvent studies using deuterated chloroform and toluene.
  • Structural analysis to identify key interactions, such as H-π interactions.

Main Results:

  • The novel four-membered sulfur-chelated ruthenium complex was successfully synthesized.
  • The complex demonstrated latency in olefin metathesis, requiring heat or UV irradiation for activation.
  • Reactivity was comparable to five-membered ring analogs, despite the increased ring strain.
  • Key H-π interactions were identified as crucial for the complex's stability.

Conclusions:

  • A new class of sulfur-chelated ruthenium complexes has been introduced.
  • This ruthenathiete complex offers stimuli-promoted olefin metathesis capabilities.
  • The findings open avenues for designing novel catalysts with tunable reactivity for advanced organic synthesis.