Potassium trithiocarbonate, preparation

Reduction of carbon disulfide also provides a starting point for the synthesis of these compounds. For small scale preparation the electrochemical reduction of CS2 in DMF on a platinum or mercury electrode offers a way for the preparation of 4,5-dithio-l,3-dithiole-2-thione dianion (248) (together with significant amounts of potassium trithiocarbonate (249)), which upon alkylation gives access to 4,5-bis(alkylsulfanyl)-1,3-dithiole-2-thiones (252) (Scheme 51) <74J A945,74JOC511,81JOC775). How-... 

Dibromobutyne was used in the preparation of cyclic trithiocarbonates with a propadiene side-chain. From potassium trithiocarbonate, a double substitution occurs in the presence of 18-c-6. 59 Sonication speeds up the reaction by a factor of 10. Without sonication, only polymers are formed. 

Synthesis.—In the course of their investigations in the field of simple trithiocarbonates, Gattow and his co-workers have prepared the cyclic trithiocarbonates (284) and (285) by reactions involving the action of methylene iodide on potassium trithiocarbonate, and the treatment of hydrogen trithiocarbonate with dimeric thiophosgene, respectively. The... 

Compounds (1), (2) and (3) have been prepared by several cyclization procedures (see [1-3,25,28,35,37,73,75,77,216,246] and refs, therein). Vinylene trithiocarbonate (la ) can be obtained in a good yield by treating potassium trithiocarbonate, KS-C(=S)-SK, with 1,2-dichloroethyl ethyl ester, ClCH2CHCl(OEt), followed by elimination of ethanol with / -toluenesulfonic acid. Vinylene trithiocarbonate... 

The l,3-dithiolane-2-thione (326) was first prepared by the reaction of ethylene dibromide with sodium trithiocarbonate in ethanol (1862LA(123)83>. Presumably the best synthesis of (326) is the reaction of ethylene oxide with carbon disulfide and potassium hydroxide in methanol at room temperature (46JCS1050). 

---