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Nickel-Catalyzed Alkene Difunctionalization as a Method for Polymerization.

Julia N Katzbaer1, Vincent M Torres1, Elizabeth Elacqua1

  • 1Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.

Journal of the American Chemical Society
|June 21, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel nickel-catalyzed alkene difunctionalization for polymer synthesis, creating unique poly[arylene-α-(aryl)ethylene]s with regular aryl group intervals and high thermal stability.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Alkene difunctionalization is a key synthetic tool for creating complex molecules.
  • Its application in polymer synthesis, particularly for stereodefined polymers, remained unexplored.
  • Developing new polymerization methods is crucial for advanced materials.

Purpose of the Study:

  • To report the first example of nickel-catalyzed alkene difunctionalization for polymer synthesis.
  • To investigate the regioselectivity and characteristics of the resulting polymers.
  • To explore the potential of this method for creating novel poly(arylene-α-ethylene)s.

Main Methods:

  • Nickel-catalyzed difunctionalization of alkenes using arylboronic esters and aryl bromides.
  • Regioselective polymerization with specific addition across the alkene.
  • Fractionation to isolate polymers from oligomeric species.
  • Thermal analysis (TGA, DSC) to determine polymer properties.

Main Results:

  • Successful synthesis of poly[arylene-α-(aryl)ethylene]s via a novel Ni-catalyzed difunctionalization polymerization.
  • Regioselective addition of aryl bromide to the terminal carbon and arylboronic ester to the internal benzylic carbon.
  • Obtained polymers with molecular weights ranging from 30 to 175 kDa.
  • Polymers exhibit high thermal stability (up to ~399 °C) and a glass transition temperature (Tg) of 90 °C.

Conclusions:

  • This work establishes a new route for synthesizing poly[arylene-α-(aryl)ethylene]s through alkene difunctionalization.
  • The resulting polymers possess desirable thermal properties comparable to established polymers like polystyrene.
  • This method opens avenues for engineering advanced polymers with tailored properties.