Used primarily as a nitrosating agent in organic synthesis, enabling the introduction of nitroso groups into aromatic and aliphatic compounds. Commonly applied in the preparation of nitrosamines, which serve as intermediates in pharmaceutical and agrochemical manufacturing. Also utilized in electrochemical applications as a strong oxidant, particularly in non-aqueous media for doping conductive polymers. Its high reactivity makes it suitable for research settings where controlled nitrosation is required.