1, 3-Dibromo-5, 5-Dimethylhydantoin is a helpful and simple-to-handle reagent for brominating a variety of aromatic derivatives substituted with electron-donating groups. It is employed in the bleaching process in pulp and paper mills, the treatment of recreational water, the purification of drinking water, and the maintenance of commercial and industrial cooling systems. It works well and selectively to convert thiols to disulfides in solutions or without the need of a solvent. This chemical is very effective as well as economical and safe to use.