Messrs Jones and Tasker, A coloured thio-oxalate. 95 



In order to see if C2O2 could be obtained as the result of 

 decomposing this substa,nce, it was heated in an evacuated vessel 

 with metallic sodium. The resultant gas was collected by means 

 of a Sprengel pump. There was a sudden rush of gas, in quantity 

 far short of the theoretical, and some deposition of carbon. The 

 gas was insoluble in water or potash but was soluble in cuprous 

 chloride and burnt with a blue flame. Its vapour density was 

 taken by weighing a known volume. It corresponded with that 

 required for carbon monoxide. 



94-24 c.c. at 654 mm. and 16° C. weighed -1002 gms. 

 Vapour density (H = 1) 14'5 

 Theory for CO 14 



With concentrated sulphuric acid, carbon monoxide is again 

 given off and a purple colour is given which is characteristic of the 

 behaviour of diphenyl-disulphide under the same conditions. 



Other coloured esters and several metallic salts of dithio-oxalic 

 acid have been prepared, and their properties and derivatives are 

 being investigated. 



