Used as a source of fluoride ions in organic synthesis, particularly in reactions requiring mild and soluble fluoride sources. It facilitates desilylation, cleaving silicon protecting groups from alcohols, amines, and other functional groups under neutral or slightly basic conditions. Its solubility in polar organic solvents makes it suitable for use in non-aqueous reaction systems. Also employed in the preparation of labeled compounds and in some electrochemical applications due to the stability of the tetraethylammonium cation.