Potassium trithiocarbonate

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 CS3(2−). 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

Potassium trithiocarbonate reacts with alkylating agents to give trithiocarbonate esters:
 * K2CS3 + 2 RX → (RS)2CS + 2 KX (X = halogen, R = monovalent organyl group)