In this study, N,N,N0 ,N0-tetrabromobenzene-1,3-disulfonamide and poly(N-bromo-N-ethylbenzene-1,3- disulfonamide) were used as efficient catalysts for the one-pot synthesis of 3,5,6-trisubstituted-1,2,4- triazines from readily available acid hydrazides, ammonium acetate and dicarbonyl compounds at 100 C in good to excellent yields under solvent-free conditions.
