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and Behrooz MalekiChemistry Department, College of Science, Bu-Ali Sina University, Hamadan 65174, IranReceived July 9, 2003Key Words : 1,3-Dibromo-5,5-dimethylhydantoin (DBH), 1,3,5-Trisubstituted pyrazolines, Pyrazoles,Solvent-free conditionsFive-membered heterocyclic compounds are stable aromaticcompounds and have been used commercially as pharma-ceuticals, pesticides, and dyestuffs. These compounds arealso important constituents that often exist in biologicallyactive natural products and synthetic compounds ofmedicinal interest.

bulletin of the korean chemical society

1,3-Dibromo-5,5-dimethylhydantoin as a Novel Oxidizing Agent for the Oxidation of 1,3,5-Trisubstituted Pyrazolines under Both Heterogeneous and Solvent-free Conditions