https://www.merriam-webster.com/dictionary/sulfonium
SULFONIUM Definition & Meaning - Merriam-Webster
The meaning of SULFONIUM is a monovalent group or cation SH3 or derivative SR3.
definitionmeaningmerriamwebster
https://pubs.rsc.org/en/Content/ArticleLanding/1995/C3/C39950001113
Tris(dimethylamino)sulfonium,...
tris
https://www.semanticscholar.org/topic/dimethyl%28methylthio%29sulfonium-tetrafluoroborate/1132618
dimethyl(methylthio)sulfonium tetrafluoroborate | Semantic Scholar
dimethylsemanticscholar