A sulfoxide is a chemical compound containing a sulfinyl functional group attached to two carbon atoms. Sulfoxides are the thio equivalents of ketones. (The use of the alternative name sulphoxide is discouraged by IUPAC.)

Nature of the bond

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The structural formula of a sulfoxide is generally represented as R-S(=O)-R' where R and R' are the organic groups. The bond between the sulfur and oxygen atoms is not a normal double bond (with overlap of π bonds between p orbitals of adjacent atoms), and it is believed that electrostatic interaction between a negatively charged oxygen and positively charged sulfur accounts for most of the bonding.

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