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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
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Product selectivity control induced by using liquid-liquid parallel laminar flow in a microreactor.

Fumihiro Amemiya1, Hideyuki Matsumoto, Keishi Fuse

  • 1Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 2268502, Japan.

Organic & Biomolecular Chemistry
|April 13, 2011
PubMed
Summary

This study demonstrates precise product selectivity in microreactor systems using liquid-liquid parallel laminar flow. Electrochemical methods control regioselective cross-coupling reactions via cathodic reduction, optimizing chemical synthesis.

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Organic Synthesis

Background:

  • Controlling product selectivity in chemical reactions is crucial for efficient synthesis.
  • Microreactor technology offers precise control over reaction conditions.
  • Achieving regioselective and chemoselective reactions often requires tailored methodologies.

Purpose of the Study:

  • To demonstrate product selectivity control using a microreactor with liquid-liquid parallel laminar flow.
  • To achieve regioselective cross-coupling of aldehydes with allylic chlorides.
  • To investigate the role of cathodic reduction and flow conditions in controlling reaction outcomes.

Main Methods:

  • Utilized an electrochemical microreactor system.
  • Employed liquid-liquid parallel laminar flow.
  • Determined benzaldehyde diffusion coefficient using electrochemical measurements.
  • Performed computational fluid dynamics (CFD) simulations.
  • Conducted flow mode experiments to confirm the necessity of parallel laminar flow.

Main Results:

  • Successfully demonstrated product selectivity control.
  • Achieved regioselective cross-coupling of aldehyde with allylic chloride via chemoselective cathodic reduction.
  • Estimated benzaldehyde diffusion coefficient as 1.32 × 10(-7) cm(2) s(-1).
  • CFD simulations confirmed the formation of a clear concentration gradient due to the flow.
  • Flow mode experiments validated the importance of liquid-liquid parallel laminar flow.

Conclusions:

  • Liquid-liquid parallel laminar flow in a microreactor enables effective product selectivity control.
  • The electrochemical microreactor system facilitates regioselective and chemoselective cross-coupling reactions.
  • Understanding diffusion coefficients and flow dynamics is key to optimizing microreactor performance for selective synthesis.