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Continuous Ligand-Free Catalysis Using a Hybrid Polymer Network Support.

Bradley A Davis1, Jan Genzer1, Kirill Efimenko1,2

  • 1Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States.

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|September 1, 2023
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Summary
This summary is machine-generated.

A novel palladium catalyst supported on a hybrid polymer network enables efficient continuous flow synthesis. This system demonstrates high yields and stability for Suzuki-Miyaura coupling and nitroarene hydrogenation, offering industrial advantages.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Organic Chemistry

Background:

  • Traditional batch homogeneous reactions face limitations in pharmaceutical and fine chemical industries.
  • Continuous flow reactors offer potential improvements but require effective heterogeneous catalysis.
  • Developing robust and versatile catalytic systems is crucial for intensified chemical synthesis.

Purpose of the Study:

  • To design and evaluate a versatile network-supported palladium (Pd) catalyst for continuous flow synthesis.
  • To optimize the catalyst and process parameters for Suzuki-Miyaura cross-coupling and nitroarene hydrogenation.
  • To demonstrate the industrial applicability of the developed heterogeneous catalytic system.

Main Methods:

  • Synthesis of a hybrid polymer network using poly(methylvinylether-alt-maleic anhydride) and branched polyethyleneimine.
  • Immobilization of palladium (Pd) onto the hybrid polymer support.
  • Utilizing automated exploration for parameter and substrate scope screening in continuous flow reactors.
  • Performing Suzuki-Miyaura cross-coupling and nitroarene hydrogenation reactions.

Main Results:

  • Achieved steady-state yields up to 92% for Suzuki-Miyaura cross-coupling with aryl bromides in 20 min residence time.
  • Demonstrated high activity and mechanical stability with no detectable Pd leaching up to 95 °C.
  • Obtained >99% yields for nitroarene hydrogenation in <2 min residence time at room temperature, with over 20 h of continuous operation without deactivation or leaching.

Conclusions:

  • The hybrid network-supported Pd catalyst is effective for intensified continuous flow synthesis of complex organic compounds.
  • The catalytic system offers high yields, stability, reusability, and environmental benefits, making it suitable for industrial applications.
  • This versatile heterogeneous catalyst system addresses shortcomings of traditional batch processes and enables efficient chemical transformations.