Ryan and Cullinane — Some Derivatives of Stilbene. 163 



4.-Q-I)initrostilhcne-2-diazonium sulphate. 



Dinitroarainostilbene (2 grams) was dissolved in alcoliol, and concentrated 

 sulphuric acid fl-1 c.c.) was added gradually with shaking and cooling. The 

 sulphate remained in solution. About 1"5 c.c. of amyl nitrite were poured 

 drop by drop into the cold solution, which was shaken thoroughly during the 

 addition. On allowing the solution to remain at the room temperature for 

 some Iiours, the diazo- derivative was precipitated as a red solid, which on 

 crystallization from glacial acetic acid gave orange-red aoicular prisms, 

 decomposing at about 230° C. 



In conclusion, we wish to state that this investigation was undertaken at 

 the request of the research section of Nobel's Explosives Company, and that 

 we are also indebted to the Department of Scientific and Industrial Research 

 for a grant in aid of the investigation. 



K.l.A. PROC, vol.. XXXVI, SECT. B. [Z^ 



