sulfonium compounds

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
See: 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