Potassium trithiocarbonate is the inorganic compound with the chemical formula K₂CS₃. It is the potassium salt of trithiocarbonic acid. It consists of two potassium cations K⁺ and the trigonal planar trithiocarbonate dianion CS2−3. It is a white solid, although impure samples often appear brown. It is prepared by the reaction of potassium sulfide or potassium hydrosulfide with carbon disulfide.

K₂S + CS₂ → K₂CS₃

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Potassium trithiocarbonate

Identifiers
CAS Number	26750-66-3
3D model (JSmol)	Interactive image
ECHA InfoCard	100.008.667
EC Number	247-959-3
PubChem CID	117858
InChI InChI=1S/CH2O2S.2K/c2-1(3)4;;/h4H,(H,2,3);;/q;2*+1/p-2 Key: JOKZZQQDSRIMNE-UHFFFAOYSA-L
SMILES C(=O)([O-])[S-].[K+].[K+]
Properties
Chemical formula	K2CS3
Molar mass	186.39 g·mol−1
Appearance	White solid, often brown due to impurities
Related compounds
Related compounds	Trithiocarbonic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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Potassium trithiocarbonate reacts with alkylating agents to give trithiocarbonate esters:^[1]

K₂CS₃ + 2 RX → (RS)₂CS + 2 KX (X = halogen, R = monovalent organyl group)