sulfenyl radicals

https://doi.org/10.1351/goldbook.S06101
Sulfur-centered radicals having the structure RS. (RH). This term is derived from sulfenic acids. The synonymous term sulfanyl radicals is derived from sulfane, H2S. E.g. CH3S. methylsulfanyl or methanesulfenyl radical. An older synonymous term is alkylthio radical.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1368 (https://doi.org/10.1351/pac199567081307)