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

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

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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: 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 of a...
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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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Extraction: Advanced Methods00:56

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Base-Catalyzed Ring-Opening of Epoxides02:26

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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Copper Selective Polymeric Extractant Synthesized by Ring-Opening Metathesis Polymerization.

Robert Fimognari1, Leander M Cinninger1, Vincent M Lynch1

  • 1Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712-1224, United States.

Inorganic Chemistry
|December 19, 2017
PubMed
Summary
This summary is machine-generated.

Novel polymers selectively bind copper ions (Cu2+) for purification. This research demonstrates high selectivity for Cu2+ over other metals, including nickel, using advanced polymer materials.

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Area of Science:

  • Polymer Chemistry
  • Separation Science
  • Coordination Chemistry

Background:

  • Developing selective materials for metal ion separation is crucial for purification processes.
  • Picolinic acid functionalities are known to chelate metal ions.
  • Ring-opening metathesis polymerization (ROMP) offers a versatile route to novel polymer architectures.

Purpose of the Study:

  • To synthesize novel polymers with pendant picolinic acid functionalities using ROMP.
  • To evaluate the selectivity of these polymers for copper(II) ions (Cu2+) against other divalent metal cations.
  • To assess the potential of these polymers in separation-based purification protocols, including radioisotope purification.

Main Methods:

  • Synthesis of novel polymers via ring-opening metathesis polymerization (ROMP).
  • Preparation of the corresponding monomer bearing picolinic acid functionalities.
  • Metal ion selectivity studies using pH-dependent liquid-liquid and solid-liquid extraction.
  • Evaluation of selectivity in mock purification protocols, specifically for Cu2+ over Ni2+.

Main Results:

  • The synthesized polymers and monomer demonstrated selective binding for Cu2+ over various other divalent metal cations.
  • High selectivity for Cu2+ was observed even in the presence of a significant excess of Ni2+.
  • Separation factors reaching as high as 290 were achieved for Cu2+ extraction from solutions with a 100-fold excess of Ni2+.

Conclusions:

  • Novel polymers with pendant picolinic acid groups synthesized via ROMP are effective for selective Cu2+ separation.
  • The polymer system exhibits excellent selectivity for Cu2+, relevant for applications such as Cu radioisotope purification.
  • These findings highlight the potential of functionalized polymers in advanced separation technologies.