1,5-Dithiacyclooctane

1,5-Dithiacyclooctane (DTCO) is an organosulfur compound with the formula (CH$2$CH$2$)CH$2$S)$2$. 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.