any of several oxohalides of sulfur with the general formula SO2X2, where X represents a halogen. The
group is called the sulfuryl group or the sulfonyl group.
Sulfuryl fluoride, SO2F2, is a colorless gas that condenses to a liquid at – 55°C and solidifies at – 136°C; it is sparingly soluble in water and has low chemical reactivity (for example, it does not react with molten sodium).
Sulfuryl choride, SO2C12, is a colorless, pungent liquid that boils at 69.2°C and solidifies at – 54.7°C. It fumes in air and is hydrolyzed according to the reaction
SO2Cl2 + 2H2O = H2SO4 + 2HCl
Sulfuryl chloride is obtained by the reaction of SO2 with Cl2 in the presence of catalysts, such as activated carbon or camphor. It is used as a chlorinating agent in organic synthesis.
Mixed sulfuryl halides, such as sulfuryl chlorofluoride, SO2C1F, are also known.