1,5-Dithiacyclooctane (DTCO) is an organosulfur compound with the formula (CHCH)CHS). This cyclic dithioether is a colorless oil that is soluble in polar solvents. It forms a variety of transition metal thioether complexes.
DTO can be oxidized to the bicyclic dication.
DTCO was first prepared in 4% yield by dialkylation of 1,3-propanedithiol with 1,3-dibromopropane.