thioketene

thumb|right|The general structure of thioketenes

In organic chemistry, thioketenes are organosulfur compounds analogous to ketenes with the general formula , where R is alkyl or aryl. The parent thioketene (ethenthione) has the formula . It is the simplest thioketene. Ethenthione is stable as a gas, but like most thioketenes, it polymerizes upon condensation.