Thiolcarbonic Acid, HS.CO.OH

Thiolcarbonic Acid, HS.CO.OH, yields carbon oxysulphide, COS, by decomposition; its esters yield alcohols or mercaptans when saponified, according to whether the alkyl group is attached to oxygen or to sulphur; by this means the constitutions of the thiocarbonic acids are established.

It may be observed that thion- and thiol-carbonic acids are isomeric, as well as thiolthion- and dithiol-carbonic acids.