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Cathodic oxygen-reduction-reaction-mediated active peroxide for oxidizing cyclohexanone to ε-caprolactone.

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Researchers developed an electro-thermochemical system for synthesizing ε-caprolactone. This method uses oxygen reduction to *OOH and cyclohexanone oxidation, achieving high selectivity and yield for this valuable chemical compound.

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Area of Science:

  • Electrochemistry
  • Organic Synthesis
  • Catalysis

Background:

  • ε-caprolactone is a key monomer for producing biodegradable polymers like polycaprolactone.
  • Efficient and selective synthesis methods are crucial for sustainable chemical production.

Purpose of the Study:

  • To design a novel electro-thermochemical cascade reaction system for ε-caprolactone synthesis.
  • To achieve high selectivity and yield using an electrode-mediated process.

Main Methods:

  • Cathodic oxygen reduction reaction (ORR) to generate hydroperoxyl radicals (*OOH).
  • Electrochemical oxidation of cyclohexanone mediated by *OOH.
  • Utilizing a cascade reaction system for efficient synthesis.

Main Results:

  • Achieved 87.5% selectivity for ε-caprolactone.
  • Obtained a high yield of 198.55 µmol cm-2 h-1.
  • The reaction proceeded efficiently at 0 V vs. RHE.

Conclusions:

  • The developed system demonstrates a promising route for ε-caprolactone synthesis.
  • Electrocatalytic cascade reactions offer a sustainable approach for producing valuable chemicals.
  • This method highlights the potential of electrochemistry in organic synthesis.