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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
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.
2.0K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.6K
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.
7.6K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
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...
1.9K
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

9.9K
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
9.9K

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Updated: Jun 8, 2025

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Poly(arylene ether)s via Cu(II)-Catalysis.

Benedikt S Schreib1, Timothy M Swager1

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

ACS Macro Letters
|November 4, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new copper-catalyzed method for synthesizing poly(arylene ether)s (PAEs) from aryl bromides and bisphenols. This expands the range of accessible PAEs, including functional materials with tunable properties.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Poly(arylene ether)s (PAEs) are important thermoplastic materials.
  • Current synthesis methods for PAEs are limited, restricting the variety of obtainable polymers.

Purpose of the Study:

  • To develop a novel and versatile method for synthesizing a wider range of PAEs.
  • To explore the synthesis of functional PAEs with tunable properties.

Main Methods:

  • Copper(II)-catalyzed polycondensation reaction.
  • Utilized electronically unactivated aryl bromides and bisphenols as monomers.
  • Characterization of synthesized PAEs for thermal and mechanical properties.

Main Results:

  • Successfully synthesized a diverse array of new PAEs using the developed method.
  • Characterized the thermal and mechanical properties of the resulting polymers.
  • Created functional PAEs incorporating reversible acid- and redox-triggered chromophores.

Conclusions:

  • The copper(II)-catalyzed polycondensation offers a versatile route to novel PAEs.
  • The method allows for the incorporation of functional groups, leading to advanced materials.
  • This approach significantly broadens the scope of accessible poly(arylene ether)s.