sulfonium compounds

https://doi.org/10.1351/goldbook.S06121
Compounds having the structure R3S+ and associated anion (generally, but not necessarily, all three R groups are hydrocarbyl). E.g. [(CH3)3S]+Cl, trimethylsulfonium chloride, or
S06121.png
See: hydrocarbyl groups, onium compounds
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)