thioketone S-oxides

https://doi.org/10.1351/goldbook.T06357
Compounds having the structure R2C=S=O (R ≠ H). (Also known by the disapproved term sulfines which comprises thioaldehyde S-oxides and thioketone S-oxides.)
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1372 (https://doi.org/10.1351/pac199567081307)