thioketones

Compounds in which the oxygen of a ketone has been replaced by divalent sulfur R2C=S ( RH ), e.g. CH3C(=S)CH2CH3 butane-2-thione.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