Choline chloride and itaconic acid-based deep eutectic solvent has been identified as an effective catalyst and reaction medium for synthesis of 13-aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraones by condensation of 2-hydroxynaphthalene-1,4-dione with various aldehydes. The reaction conditions are mild and environmentally friendly. Graphical abstract RCHO O O OH O O O O O R ChCl/itaconic acid + 2 80 o C
The title compounds are prepared by metal‐free condensation of hydroxynaphthalenedione with various aromatic aldehydes using choline chloride/itaconic acid as efficient catalyst and reaction medium.
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