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Keywords:

  • adipic acid;
  • hydrogen peroxide;
  • microreactor;
  • oxidation;
  • process intensification
Thumbnail image of graphical abstract

Safe only in a microreactor! The synthesis of adipic acid from cyclohexene by tungstic acid-catalyzed oxidation using hydrogen peroxide following the classical Noyori protocol can be accomplished in good yields with residence times as short as 20 min at 140 °C using a safe and scalable microreactor environment. Under these intensified conditions the use of a phase-transfer catalyst is not required.