A green and highly efficient method for the synthesis of 1,8-dioxooctahydroxanthenes catalyzed by melamine
trisulfonic acid (MTSA) as a heterogenous and recyclable organocatalyst under solvent-free conditions is reported. This
procedure provides many advantages such as easy work-up, clean conversions, short reaction times and high yields of the
Keywords: Aromatic aldehyde, chemoselective, heterogenous catalyst, dimedone, 1, 8-dioxooctahydroxanthenes, 1, 3-dicarbonyl
compounds, melamine trisulfonic acid, organocatalyst, solvent-free, solid acid.
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