Abstract
A new Bronsted acidic ionic liquid has been synthesized using caffeine and p-toluenesulfonic acid as precursors. The IL was fully characterized by FT-IR, 1H NMR, 13C NMR, MS, elemental analysis, as well as Hammett acidity function. The prepared reagent is efficiently able to catalyze the synthesis of 1,8-dioxo-octahydroxanthenes under solvent-free conditions. Various advantages associated with this method include novelty and easy preparation of catalyst, simple work-up procedure and purification, short reaction times, high product yields, and easy recovery and reusability of the catalyst.
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