Used as an oxidizing agent in organic synthesis, particularly in allylic and benzylic oxidations (e.g., Riley oxidation) of unsaturated or aromatic compounds to form allylic alcohols, aldehydes, or ketones. Commonly employed in the production of dyes, pharmaceuticals, and fragrance intermediates. Serves as a reagent in the preparation of various selenium-containing compounds for applications in electronics, semiconductors, and analytical chemistry. Also used in the glass industry to decolorize and clarify glass by oxidizing iron impurities, and in some metal surface treatments for corrosion resistance.