WHICH NITEOGEN IS SUBSTITUTED EOE HYDEOGEN. 
709 
Calculated. 
Found. 
^6 
72 
43-90 
44-06 
H 4 
4 
2-44 
2-64 
n 4 
56 
34-15 
— 
g 2 
32 
19-51 
— 
164 
100-00 
(3 Diazonitrobenzol compounds. 
Nitrate of (3 Diazonitrobenzol , € 6 H 3 (N0 2 )N 2 , HN0 3 , 
is obtained from the nitrate of (3 nitraniline. The (3 does not differ much from the 
corresponding a compound in solubility ; they however exhibit perceptible differences in 
the forms of their crystals, which in the (3 compound are columns, frequently approach- 
ing the cubical form, whilst the crystals of the nitrate of a diazonitrobenzol are long 
needles of a somewhat unpronounced character. 
Perbromide of (3 Diazonitrobenzol , € 6 H 3 (NG 2 )N 2 , HBr 3 . 
On treating an aqueous solution of the nitrate of (3 diazonitrobenzol with bromine- 
water the new compound is thrown down generally as an oil, which soon solidifies. 
It forms small plates or prisms of an orange colour, which seem to differ from the 
crystals of the a compound by their want of stability when treated with warm alcohol, 
and which I have scarcely ever been able to recrystallize. I have obtained the per- 
bromide of (3 diazonitrobenzol also by the action of bromine upon (3 diazo-amidonitro- 
benzol by suspending the latter in water and adding bromine till the whole is converted 
into a heavy brownish-red oil. The supernatant aqueous mother-liquor is decanted and 
the excess of bromine allowed to evaporate spontaneously, when the oil solidifies to a 
crystalline mass. 
Before, however, complete solidification occurs, thick yellowish-red prisms are fre- 
quently seen to shoot out, of about an inch in length, which consist of almost pure 
perbromide containing mere traces of tribromnitraniline, a body which forms in the 
reaction to nearly the same extent, as will be seen from the following equation : — 
€ 12 H 9 (N0 2 ) 2 N 3 + 8Br=9 6 H 3 (NO a ) N 2 , HBr 3 +0 6 H 3 (NG 2 ) Br 3 N + 2HBr. 
y — - ' ' v— ' ' ' 
/3 diazoamidotribenzol. /3 perbromide. Tribromnitraniline. 
The adhering tribromnitraniline* can be removed by washing the finely pulverized 
crystals with ether, in which the perbromide is almost insoluble. 
* In order to obtain the tribromnitraniline in a pure state the ethereal solution is evaporated to dryness, and 
the residue dissolved by warm alcohol. Water is then added to the alcoholic solution till it becomes milky and 
deposits crystals. These are thrown upon a filter, and then pressed between sheets of filter paper, in order to 
remove any adhering bromonitrobenzol, and purified further by recrystallization from weak alcohol. Tribrom- 
nitraniline crystallizes in small, slightly yellowish plates, which cannot be sublimed without decomposition. 
The analysis of this compound will be found in another place. 
5 b 2 
