sulfones

https://doi.org/10.1351/goldbook.S06117
Compounds having the structure, RS(=O)2R (R ≠ H), e.g. C2H5S(=O)2CH3 ethyl methyl sulfone.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1369 (https://doi.org/10.1351/pac199567081307)