In this work, we used nano-sized protonated Zeolite Socony Mobil-5 (HZSM-5) zeolite as a mild and efficient catalyst for the synthesis of tetrahydroimidazo [4,5-d]imidazole-2,5(1H,3H)dione (=glycoluril) (1) and its derivatives (2-6) through reaction between urea and dicarbonyl compound. The yield of the reactions and products were determined and discussed. The Zeolite Socony Mobil-5 (ZSM-5) nanozeolite has more reactivity in its H form. HZSM-5 was prepared by ion exchange of ZSM-5 nanozeolite with NH 4 Cl, followed by drying and calcination.
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