thioketones

https://doi.org/10.1351/goldbook.T06356
Compounds in which the oxygen of a ketone has been replaced by divalent sulfur R2C=S (RH), e.g. CH3C(=S)CH2CH3 butane-2-thione.
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)