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

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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.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

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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.
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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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.
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Telechelics Based on Catalytic Alternating Ring-Opening Metathesis Polymerization.

Subhajit Pal1, Mahshid Alizadeh1, Andreas F M Kilbinger1

  • 1Department of Chemistry, University of Fribourg, Chemin du Musée 9, CH-1700 Fribourg, Switzerland.

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Summary
This summary is machine-generated.

This study presents a catalytic method for synthesizing alternating telechelic ROMP copolymers using Grubbs

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Ring-opening metathesis polymerization (ROMP) is a versatile technique for polymer synthesis.
  • Developing controlled methods for synthesizing telechelic polymers with specific end-group functionalities is crucial for advanced material applications.

Purpose of the Study:

  • To develop a catalytic protocol for synthesizing alternating telechelic ROMP copolymers.
  • To explore the use of Grubbs' second-generation catalyst in this process.
  • To investigate the influence of chain transfer agents (CTAs) on copolymer synthesis and end-group control.

Main Methods:

  • Synthesis of alternating telechelic ROMP copolymers using 7-oxa-norbornene derivatives and cycloalkenes.
  • Utilizing Grubbs' second-generation catalyst for polymerization.
  • Employing symmetrical chain transfer agents (CTAs) to control molar mass and introduce end-group functionality.
  • Characterization using 1H NMR spectroscopy, MALDI-ToF mass spectrometry, and SEC analysis.

Main Results:

  • Successfully synthesized alternating telechelic ROMP copolymers.
  • Demonstrated that sterically less hindered backbone double bonds facilitate secondary metathesis reactions.
  • Achieved control over molar mass by adjusting the monomer to CTA ratio.
  • Confirmed the chemical identity and telechelic nature of the copolymers with excellent yields and molar mass control.

Conclusions:

  • A catalytic protocol for synthesizing alternating telechelic ROMP copolymers has been established.
  • The method allows for the creation of functional telechelic polymers under thermodynamic equilibrium conditions.
  • The CTA plays a key role in controlling polymer architecture and end-group functionality.