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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: Overview01:13

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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...
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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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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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Stereocontrolled acyclic diene metathesis polymerization.

Ting-Wei Hsu1, Samuel J Kempel1, Alyssa P Felix Thayne1

  • 1Department of Chemistry, Texas A&M University, College Station, TX, USA.

Nature Chemistry
|October 25, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a stereoretentive acyclic diene metathesis polymerization. This method efficiently controls cis/trans geometry in polyalkenamers, enabling new material synthesis with tunable properties.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • The cis/trans geometry of olefins significantly impacts polyalkenamer properties.
  • Existing polymerization methods offer limited control over olefin stereochemistry.

Purpose of the Study:

  • To develop a stereoretentive polymerization method for controlling olefin geometry.
  • To synthesize polyalkenamers with defined cis/trans ratios and explore their properties.

Main Methods:

  • Utilized dithiolate Ruthenium (Ru) carbene catalysts for acyclic diene metathesis polymerization.
  • Employed cis monomers and optimized reaction conditions for stereoretention.
  • Characterized resulting polymers using differential scanning calorimetry and thermogravimetric analysis.

Main Results:

  • Developed a stereoretentive acyclic diene metathesis polymerization with high cis geometry retention.
  • Synthesized various all-cis polymers including polyesters, polycarbonates, polyethers, and polysulfites.
  • Demonstrated tunable cis:trans ratios by modulating reaction temperature and time.
  • Showcased the influence of stereochemistry on polymer thermal properties.

Conclusions:

  • The developed Ru-catalyzed polymerization offers efficient stereochemical control for polyalkenamers.
  • This method facilitates the synthesis of functional polymers with predictable stereochemistry.
  • The findings enable precise tuning of material properties through stereochemical control.