Trithiapentalene

Trithiapentalene
Names
	Preferred IUPAC name 7λ4-[1,2]Dithiolo[1,5-b][1,2]dithiole
	Other names 1,6,6aλ4-Trithiapentalene, 6a-Thiothiophthene, 6a-Thiathiophthene
Identifiers
CAS Number	252-09-5;
3D model (JSmol)	Interactive image;
ChemSpider	119841;
PubChem CID	136064;
UNII	YCW5D22WNB ;
CompTox Dashboard (EPA)	DTXSID80948052 ;
	InChI InChI=1S/C5H4S3/c1-3-6-8-5(1)2-4-7-8/h1-4H Key: JUEJPBZMWHMMPS-UHFFFAOYSA-N;
	SMILES C1=CSS2=C1C=CS2;
Properties
Chemical formula	C5H4S3
Molar mass	160.27 g·mol−1
Appearance	Orange–red solid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Trithiapentalene is an organic bicyclic molecule containing two sulfur heterocycles. Its 10-π aromatic structure is similar to naphthalene. There has been a literature dispute about whether the connectivity among the three sulfur atoms is a case of rapid tautomerization between two valence tautomers or a 3-center 4-electron bond.

The reactions have been little studied. It forms a dinickel complex upon reaction with bis(allyl)nickel.