Used primarily as an alkylating agent in organic synthesis, particularly in the preparation of radiolabeled compounds for positron emission tomography (PET) imaging. Its reactivity allows for efficient introduction of the 2-fluoroethyl group, which is valuable in the development of fluorine-18 labeled tracers. These tracers are used in neuroscience and oncology to study biological processes and disease progression in vivo. Due to its ability to transfer the fluoroethyl moiety under mild conditions, it is favored in automated radiosynthesis modules where speed and high yield are critical. Handling requires caution due to its potential toxicity and alkylating activity toward biomolecules.