Silica-Supported 1,3-Dibromo-5,5-dimethylhydantoin (DBH) as a Useful Reagent for Microwave-Assisted Aromatization of 1,3,5-Trisubstituted Pyrazolines under Solvent-Free Conditions - Azarifar, Davood; Zolfigol, Mohammad Ali; Maleki, Behrooz (Synthesis, 2004)