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Keywords:

  • low melting mixture;
  • deep eutectic solvent;
  • xanthenes;
  • aryl aldehydes;
  • green chemistry

Abstract

A low melting citric acid-urea mixture was found to be a new and effective promoting medium for the environmentally friendly synthesis of 1,8-dioxo-dodecahydroxanthene derivatives by condensation of aromatic aldehydes and cyclic 1,3-dicarbobonyl compounds. This deep eutectic solvent acts as both the reaction medium and catalyst, furnishing xanthenediones in high to excellent yields.