Aim and Objective: In this work, we synthesized and characterized a novel Brönsted
acidic ionic liquid from the reaction of N, N, N’, N’-tetramethylethylenediamine with chlorosulfonic
acid and explored its catalytic activity in 1, 8-dioxo-octahydroxanthenes synthesis.
Materials and Methods: Dimedone, aryl aldehydes, and the ionic liquid as the catalyst were reacted
under solvent-free conditions. The progressive of the reaction was monitored by a thin layer of
chromatography (ethyl acetate/n-hexane = 1/5). All products were characterized as the basis of their
spectra data and melting point by comparison with those reported in the literature.
Results: The prepared ionic liquid was successfully applied in the synthesis of 1, 8-dioxooctahydroxanthenes
in good to high yields on the reaction of aryl aldehyde and dimedone at 120oC
under solvent-free conditions.
Conclusion: This research demonstrates that the catalyst is impressive for 1, 8-dioxo-octahydroxanthenes
synthesis under solvent-free conditions.