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Related Concept Videos

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

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

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...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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...
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

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Related Experiment Video

Updated: May 26, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

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

Published on: August 23, 2018

Ring-closing metathesis in aqueous micellar medium.

Lionel Laville1, Clarence Charnay, Frédéric Lamaty

  • 1Institut des Biomolécules Max Mousseron, UMR 5247 CNRS-UM I-UM II, Université Montpellier II, Place E. Bataillon, 34095 Montpellier Cedex 5, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 14, 2011
PubMed
Summary
This summary is machine-generated.

This study explores ring-closing metathesis in water using gemini surfactants and ruthenium catalysts. It reveals the adsorption mechanisms and reaction steps in this novel heterogeneous catalytic process.

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Last Updated: May 26, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

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

Published on: August 23, 2018

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

Area of Science:

  • Green Chemistry
  • Catalysis
  • Supramolecular Chemistry

Background:

  • Ring-closing metathesis (RCM) is a powerful carbon-carbon bond-forming reaction.
  • Performing RCM in aqueous media presents challenges due to substrate and catalyst solubility.
  • Micellar catalysis offers a promising approach to overcome solubility issues in water.

Purpose of the Study:

  • To investigate the RCM of N,N-diallyltosylamine (DATs) and diallyldiethyl malonate in an aqueous micellar environment.
  • To elucidate the adsorption mechanisms and reaction pathways of this heterogeneous catalytic process.
  • To evaluate the influence of gemini cationic surfactants and ruthenium catalysts on the RCM reaction.

Main Methods:

  • Utilized four different gemini cationic surfactants to create micellar media.
  • Employed various ruthenium catalysts for the ring-closing metathesis reaction.
  • Conducted reactions at room temperature in an aqueous medium.

Main Results:

  • Successfully demonstrated RCM in an aqueous micellar system.
  • Provided the first elucidation of adsorption mechanisms in this specific heterogeneous catalytic system.
  • Identified key reaction steps involved in the micellar-catalyzed RCM.

Conclusions:

  • Aqueous micellar media, facilitated by gemini cationic surfactants, can effectively support RCM reactions.
  • Understanding adsorption and reaction mechanisms is crucial for optimizing heterogeneous catalysis in water.
  • This work opens avenues for more sustainable and environmentally friendly catalytic processes.