Thiirene

Thiirene
Names
	Preferred IUPAC name Thiirene
	Systematic IUPAC name Thiacyclopropene
	Other names Epithioethene; Ethyne sulfide; Acetylene sulfide
Identifiers
CAS Number	157-20-0;
3D model (JSmol)	Interactive image;
Beilstein Reference	1304471
ChEBI	CHEBI:30976 ;
ChemSpider	4574411 ;
Gmelin Reference	239545
PubChem CID	5461041;
CompTox Dashboard (EPA)	DTXSID00420123 ;
	InChI InChI=1S/C2H2S/c1-2-3-1/h1-2H Key: JTQAPFZZCXWQNQ-UHFFFAOYSA-N ; InChI=1/C2H2S/c1-2-3-1/h1-2H Key: JTQAPFZZCXWQNQ-UHFFFAOYAN;
	SMILES C1=CS1;
Properties
Chemical formula	C2H2S
Molar mass	58.10228
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Thiirene is an organosulfur compound with the formula C₂H₂S. It can be viewed as a derivative of cyclopropene, but with the methylene group replaced by sulfur. It is antiaromatic and very labile.