episulfonium ions

https://doi.org/10.1351/goldbook.E02169
Ions derived from thiiranes, in which a trivalent sulfur atom bears a positive charge:
E02169.png
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1334 [Terms] [Paper]