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Olefin Metathesis Polymerization: Overview

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...

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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: Ring-Opening Metathesis Polymerization (ROMP)

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...

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Latent olefin metathesis catalysts.

Stijn Monsaert¹, Ana Lozano Vila, Renata Drozdzak

¹Ghent University, Department of Inorganic and Physical Chemistry, Krijgslaan 281 (S3), Ghent, Belgium. stijn.monsaert@ugent.be

Chemical Society Reviews

|May 8, 2010

Summary

Latent olefin metathesis catalysts enable controlled chemical reactions by activating only when needed. This review highlights key advancements and applications of these specialized catalysts in synthesis.

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Area of Science:

Organic Chemistry
Catalysis
Synthetic Methodology

Background:

Olefin metathesis is a powerful reaction for rearranging carbon-carbon double bonds.
Developing latent catalysts is crucial for precise control in complex syntheses.
Industrial and academic interest in task-specific latent catalysts is growing.

Purpose of the Study:

To provide an overview of latent olefin metathesis catalysts.
To cover early breakthroughs and recent developments.
To illustrate catalyst applications with literature examples.

Main Methods:

Literature review of olefin metathesis catalyst development.
Focus on latent and task-specific catalyst design.
Analysis of prominent examples and their synthetic utility.

Main Results:

Overview of historical and current progress in latent olefin metathesis.
Demonstration of the utility of latent catalysts in various synthetic applications.
Identification of key trends and future directions in catalyst development.

Conclusions:

Latent olefin metathesis catalysts offer significant advantages for controlled synthesis.
Continued development is expected to expand their applicability.
These catalysts are becoming indispensable tools in modern organic chemistry.