Sodium trithiocarbonate solution

Sodium trithiocarbonate, Na2CS3,10, 369 370. An aqueous solution of Na2CS3 can he prepared by reaction of Na2S-9H20 with CS2 at 45-50 ". The solution is stable for about I week. 

The spirobis[2,4]-benzodithiepine (90) has been prepared from l,2-bis(chloromethyl)-4,5-dimethylbenzene and sodium trithiocarbonate prepared in situ and a conformational analysis has been carried out using H- and l3C-NMR, X-ray analysis and semi-empirical calculations <95JOC6335). In the solid state it exists in a chair-twisted boat conformations whereas in solution it undergoes two dynamic processes, namely pseudorotation at lower temperatures and ring inversion at higher temperatures. 

Cellulose xanthate is dissolved in aqueous sodium hydroxide solution to give a viscous liquid—the viscose. The sodium hydroxide solu-tion, which is added in excess, also results in the formation of by-products such as sodium trithiocarbonate and sodium sulfide. In addition sodium carbonate is formed. 

Further hydrolysis of the carbon disulfide and the trithiocarbonate produces hydrogen sulfide, etc (33). In another study of the decomposition of sodium ethyl xanthate [140-90-9] in flotation solutions, eleven components of breakdown were studied. The dependence of concentration of those components vs time was examined by solving a set of differential equations (34). 

When ethanol is replaced by cellulose, sodium cellulose xanthate is obtained this dissolves in aqueous alkali to give a viscous solution (viscose) from which either viscose rayon or cellophane can be obtained by adding acid to regenerate the (reconstituted) cellulose. Trithiocarbonates (CS3 "), dithiocarbonates (COS2 "), xanthates (CS2OR ), difhiocarbamates (CS2NR2 ) and 1,2-dithiolates have an extensive coordination chemistry which has been reviewed. ... 

The kinetics of the xanthation of sucrose were studied in the same year by Cherkasskaya, Pakshver, and Kargin, who determined potentiometric-ally the concentrations of the dithiocarbonate derivative and also of inorganic sulfide and trithiocarbonate. The rate of formation of 0-(sodium thiol-thiocarbonyl)sucrose was found to pass through a maximum with increasing alkali concentration, presumably due to a shift of the equilibrium in favor of side reactions in strongly alkaline solution. This result appears to parallel the qualitative findings of Lieser and Hackl for polysaccharides. 

Trithiocarbonate and dithiocarbamate decompositions in alkaline solutions have received preliminary study. The former is said to be retarded by hydroxide and sulphide ions (but also by sodium chloride) , and to involve an activation energy of 19.8 kcal.mole". ... 

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