P.T. Austen—Reactions of Dinitrobrombenzol. 123 
Mononitrobrombenzol and Potassium Cyanate. 
The substances, heated in a sealed tube to 100° with dilute 
alcohol for eight hours, gave no mononitroaniline, as was to be 
expected, since mononitrobrombenzol is not acted on by 
ammonia itself under 160°. The cyanate, however, was com- 
pletely converted into the corresponding carbonates. 
Trinttrochlorbenzol and Potassium Cyanate. 
heating for five hours at 100° no picramide was obtained. 
Dinitrobrombenzol and Water. 
_ Gottlieb* has stated that trinitrochlorbenzol was decomposed 
in the cold by water. It was afterwards found by Clemmt 
on by water even when boiling. Later, however, Engelhardt 
and Latschinofft found it was acted on by boiling water. 
With dinitrobrombenzol I found no action on boiling with 
water. The substance was then heated with water in closed 
tubes successively at 100°, 150°, and 200°, for eight hours, in 
all these tubes there was no pressure or formation of bromhydrie 
acid. At 220° a minute trace of bromhydric acid had formed, 
and the liquid was perceptibly reddened on addition of sodium 
ydrate solution. After heating at this temperature the sub- 
stance remained liquid for several days, although when it had 
solidified, it was found to have lost none of its characteristic 
properties. 
Dinitrobrombenzol and Potassium Nitrite. 
It appeared not impossible from the ease with which the 
bromine atom in dinitrobrombenzol can be substituted (although 
this is chiefly the case in substitution by a positive radical), 
om by action of potassium nitrite a trinitrobenzol = be 
peee _ The substances were heated in a closed tube six 
ours with dilute alcohol at 100°. The tube on cooling con- 
Mu. massive red needles of potassium dinitrophenylate. 
ty aldehyde had also formed. The reaction had probably 
: Chem. Pharm., xcii, 326 Journ. fr. Chem., [2], i, 145. 
7 Zz “9 4 ° . 4 . pr. > ' 
+ Zeit. Chem., 1870, 235. t 
