224 DERIVATIVES OF CARBONIC ACID. 



fats, resins. Combines with water at a low tempera- 

 ture, forming a crystalline hydrate, which is decom- 

 posed again at 3. 



Conducted over red-hot metallic oxides, carbon bi- 

 sulphide forms sulphides of the metals, carbonic anhy- 

 dride being evolved. Dry chlorine resolves it into sul- 

 phur chloride and sulphocarbonyl chloride CSCP, a liquid, 

 boiling at 70. Treated with a chlorine mixture, there 

 is further produced a chloride, CSC1 4 , a liquid, boiling 

 at 146-147 ; and this, when oxidized, yields trichlor- 

 methyl sulphochloride CC1 3 .S0 2 C1 (p. 39). Phosphorus 

 chloride and antimony chloride convert it into car- 

 bon tetrachloride CC1 4 (p. 35). The same compound 

 is formed, together with sulphur chloride, when the 

 vapor of carbon bisulphide, mixed with chlorine, is 

 passed through a red-hot tube. By the action of iodine 

 chloride on carbon bisulphide, there are produced 

 sulphur chloride, carbon tetrachloride, and a crystalline 

 compound 2(CS 2 ) + IC1 3 . Carbon bisulphide combines 

 directly with (C 2 H 5 ) 2 Zn, forming a brown, amorphous 

 compound C 5 H 10 S 2 Zn, which, when treated with hydro- 

 chloric acid, or subjected to dry distillation, yields a 

 liquid C 5 H 10 S, boiling at 130-150. It combines directly 

 with triethylphosphine, forming a red crystalline body, 

 a violent reaction taking place. 



Sulphocarbonic acid, CH 2 S 3 *= CS(SH) 2 . Carbon 

 bisulphide dissolves in alkaline sulphides, forming the 

 alkaline salts of sulphocarbonic acid. From these the 

 free acid can be separated by hydrochloric acid and 

 rapid addition of water. Reddish-brown, oily liquid. 



The sodium salt CS(SNa) 2 can be precipitated from a 

 concentrated solution of sodium sulphide, to which is 

 added carbon bisulphide, by means of alcohol or ether 

 and alcohol. Thick red liquid, soluble in water. 



Ethyl sulphocarbonate, CS(S.C 2 H 5 ) 2 , is produced 

 by pouring an alcoholic solution of ethyl iodide on the 

 sodium compound. Yellow oil, boiling at 240; inso- 

 luble in water; combines directly with two atoms of 

 bromine, forming red crystals, which in the air or 



