Trisulfuryl fluoride is an inorganic compound of fluorine, oxygen, and sulfur with the chemical formula .
The compound is obtained by the thermal disassociation of or via reaction of potassium tetrafluoroborate () with sulfur trioxide () at 70 ðC.
Also, trisulfuryl fluoride is formed in a reaction of sulfur trioxide (), boron trifluoride (), and 70% sulfuric acid () at 70 ðC.
Trisulfuryl fluoride is a reactive compound. It is known to decompose into disulfuryl fluoride when heated. The compound reacts with certain compounds, like the sodium cyanohydrin salt, to form other fluorosulfates.
It slowly hydrolizes in the solution of potassium hydroxide (KOH):
The compound forms a colorless liquid. It fumes in air and is insoluble in the concentrated .