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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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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Ring-opening polymerization of cyclohexene oxide using aluminum amine-phenolate complexes.

Hart Plommer1, Immanuel Reim, Francesca M Kerton

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Dalton Transactions (Cambridge, England : 2003)
|February 18, 2015
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Summary

Highly active aluminum catalysts enable efficient ring-opening polymerization of cyclohexene oxide, producing high molecular weight polymers with uniform dispersity under neat conditions.

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Area of Science:

  • Polymer Chemistry
  • Catalysis

Background:

  • Ring-opening polymerization (ROP) is a crucial method for synthesizing polymers.
  • Cyclohexene oxide polymerization requires efficient catalysts for controlled synthesis.

Purpose of the Study:

  • To report novel, highly active aluminum-based catalysts for cyclohexene oxide ROP.
  • To investigate the polymerization under neat reaction conditions.
  • To elucidate the polymerization mechanism.

Main Methods:

  • Ring-opening polymerization of cyclohexene oxide.
  • Catalyst characterization (down to 0.001% Al).
  • Nuclear Magnetic Resonance (NMR) studies for kinetic analysis.
  • Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) for polymer analysis.

Main Results:

  • Remarkably active catalysts demonstrated high efficiency, even at low aluminum concentrations (0.001%).
  • Production of high molecular weight polymers with narrow and uniform dispersity.
  • Kinetic data and polymer analysis provided mechanistic insights into the polymerization process.

Conclusions:

  • Aluminum catalysts are highly effective for cyclohexene oxide ROP.
  • The study achieved controlled polymerization yielding high-quality polymers.
  • Mechanistic understanding was advanced through kinetic and mass spectrometry data.