P.T. Austen—Dinitroparadibrambenzol 49 
lute* hydrochloric acid (1: 10), filtered, washed and purified by 
crystallization from dilute alcohol.t 
Analysis——A combustion gave : 
0°2852 grms. of substance ei 0°2870 grms. of CO, and 
0°0422 grms. of H,O. 
63 oT 
[4a NO, 
The formula C,H, { Ah 0;—C H.N,O,Br. 
OH 
Calculated. Found. 
C=27°38 27°44 
H== 1°38 1°64 
Properties.—This compound is identical with the dinitrobrom- 
phenol obtained by Kérnert from nitrition of bromphenol. It 
forms when crystallized from water or alcohol, long, flat, very 
thin and strongly glittering needles, fusing at 71°. Korner 
found 78°. On careful heating it volatilizes unchanged. 
Ex to the air it soon turns reddish, undoubtedly, as Korner 
suggested, from the presence of ammonia. Heated ee water, 
it fuses to a yellow oil. It has strong tinctorial powers, dying 
the skin yellow. In all these properties my observations agree 
entirely with those of Kérner. By nage with concentrated 
sulphuric acid, decomposition se bod) is libera 
which smells like nitrous acid, aie a a ho = “— giving a 
arium-salt soluble in water, is obtained. heated on a 
platinum foil, it burns brightly with a ee ae a smoky 
flame. Thrown on a red-hot platinum foil it puffs. 
On heating the phenol with fuming nitric acid a violent action 
took place. The resulting liquid on evaporation furnish an 
abundant quantity of picric acid. 
There are already several instances known where picric me 
is fovicind: te the substitution of a halide by the nitro- 
A directly analogous case is quoted by Post} who cokers 
that picric acid is formed by nitrition of | the phenol isomeric to 
this (dinitrobromphenol fusing at 117°).§ This proves con- 
clusively then, that, when a halide is expelled by direct treat- 
ment with nitric acid, we are not in a condition to assume that 
the entering nitro-group takes the same relative position as the 
antecedent halide; for, as in the case above shown, both the 
dinitrobromphenols give picric acid on nitrition. 
* In many cases the addition of concentrated hydrochloric acid to a hot, concen- 
trated solution of a nitro-phenol salt, will entirely decompose the phenol. If I am 
not mistaken, this fact has been noticed, but I cannot recall the ce. 
+ This compound is also formed when (-dinitroparabromaniline is heated with 
a solution of potassium hydra . 
Ber. d. d. Chem. Ges., vii, 
, Ber. pg kag ASS vi, 64 
Am. Jour. Sc1.—Turep Sexes, Vor Mesh 91.—JuLyY, 1878. 
