P. T. Austen—New Formation of Dinitroaniline. 121 
Amy] nitrite acts at ordinary temperatures on the nitropara- 
dibromaniline and forms, not as I formerly supposed, a dinitro- 
monobrombenzol, but the ordinary mononitroparadibrombenzol, 
All the properties of the nitrodibrombenzol (fusing point 84°) 
obtained in this manner agreed perfectly with those of the well- 
nown mononitroparadibrombenzol. 
This, as far as 1 know, is the first case in which the nitroxyl 
of a nitro-haloid-benzol is substituted by the amido-group in 
preference to the haloid atom. In the first series there is 
a deep red color, but separated from the solution as a slimy 
mass from which no product susceptible of analysis could be 
obtained, 
_By the action of natriumhydrate solution on the alphadi- 
nitroparadibrombenzol, I have obtained a substance forming red 
salts, which I take to be a nitrobromphenol, and concernmg 
Which I shall, at the earliest opportunity, give full particulars. 
Royal Laboratory of Berlin, April 16th, 1876. 
Art. XVIIL—On a New Formation of Dinitroaniline, and 
pe Reactions of Dinitrobrombenzol; by PETER TOWNSEND 
USTEN. 
ENGAGED in an extensive research concerning the stability of 
the bromine atom in dinitromonobrombenzol, led 
treat that compound with potassium cyanate in the hope of 
obtaining a dinitrophenyleyanic ester, according to the reaction, 
C*HS(NO2)2Br4+ KNCO—C*H3(NO2)2NCO + KBr. 
Dinitrobrombenzol was mixed with about one and a half 
times its volume of potassium cyanate, and the mixture heated 
% 100° in a closed tube with very dilute alcohol for eight 
ours; on cooling, the tube became filled with a mass of bri ht 
yellow leaflets, and on opening gave off carbonic acid. The 
* Ann. Chem. Pharm., exxxix, 107. 
