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The thionyl group is SO, a sulfur atom plus an oxygen atom.

It occurs in compounds such as thionyl fluoride, SOF₂.

Thionyl chloride, SOCl₂, is a common reagent used in organic synthesis to convert carboxylic acids to acyl chlorides.

In organic chemistry, the thionyl group is known as a sulfoxide group or sulfinyl group, and has the general structure RS(=O)R'. In the context of acid-base reactions, it may also be referred to as a sulfinyl group (i.e. sulfinylamines).

See also

• Sulfuryl

References

Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

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