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Enhanced Controllability of Fries Rearrangements Using High-Resolution 3D-Printed Metal Microreactor with Circular

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Stainless steel microreactors fabricated using 3D printing offer enhanced control over ultrafast chemical reactions. Circular channels in these microreactors improve mixing efficiency, leading to higher yields in rearrangement reactions.

Keywords:
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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Reaction Engineering

Background:

  • Ultrafast intramolecular rearrangement reactions present challenges in achieving high selectivity and yield.
  • Controlling reaction pathways at microscale requires precise engineering of fluid dynamics and mixing.
  • 3D printing enables the fabrication of complex microreactor geometries for advanced chemical synthesis.

Purpose of the Study:

  • To investigate the influence of microreactor cross-sectional geometry on ultrafast intramolecular rearrangement reactions.
  • To compare the performance of circular and rectangular channel 3D-printed metal microreactors.
  • To optimize reaction conditions for maximizing desired intermolecular reactions over undesired intramolecular pathways.

Main Methods:

  • Fabrication of high-resolution 3D-printed stainless steel metal microreactors (3D-PMRs) with varying channel geometries.
  • Utilizing computational fluid dynamics (CFD) simulations to assess mixing efficiency in different channel designs.
  • Conducting comparative studies of rapid Fries-type rearrangement reactions within the fabricated microreactors.

Main Results:

  • 3D-PMRs with circular channels exhibited superior mixing efficiency compared to rectangular channels (250 µm × 125 µm).
  • The circular channel design facilitated improved control over ultrafast intramolecular rearrangement reactions.
  • High conversion and yield were achieved by outcompeting undesired intramolecular rearrangement with the desired intermolecular reaction, even for reactions occurring within 333 µs.

Conclusions:

  • 3D-printed metal microreactors with optimized geometry, specifically circular channels, are effective for controlling ultrafast rearrangement reactions.
  • Enhanced mixing efficiency in circular microchannels is crucial for achieving high selectivity and yield in rapid chemical transformations.
  • This approach offers a promising strategy for precise control over fast reaction kinetics in microfluidic systems.