WHICH NITROGEN IS SUBSTITUTED EOR HYDROGEN. 
701 
The formation of this compound is expressed by the following equation 
G 6 H 3 Br N 2 HBr 3 +4NH 3 = €6 H;3 Bi ^ 2 }n + 3NH 4 Br. 
Perbromide. 
Diazobromobenzolimide. 
The quantity of diazobromobenzolimide and bromide of ammonium which is obtained 
from a given quantity of perbromide corresponds accurately with the theoretical pro- 
portions. 
08305 grm. of perbromide of diazobromobenzol, after decomposition with ammonia, 
gave with nitrate of silver T0945 grm. of bromide of silver, corresponding to 56 T per 
cent, of bromine. 
According to the above equation, one equivalent of the perbromide gives rise to 
the production of three equivalents of bromide of ammonium ; the quantity of 
bromine capable of precipitation after the action of ammonia will therefore be 56 - 6 
per cent. 
Diazobromobenzolimide presents itself generally as a white or slightly yellowish mass 
of small crystalline plates, which melt at about 20° C. to a heavy oil. It is insoluble 
in water, rather difficultly soluble in alcohol, and easily soluble in ether and benzol. It 
distils readily in the presence of water ; heated alone it explodes feebly. Left exposed 
to the open air it appears gradually to volatilize, giving off the same aromatic ammo- 
niacal odour which characterizes diazobenzolimide. It resembles the latter, moreover, 
in its behaviour with various reagents ; caustic potassa, hydrochloric acid, and bromine 
have no action upon it, strong sulphuric and nitric acids decompose it readily. 
By the action of ethylamine, aniline, &c. upon perbromide of diazobromobenzol, 
corresponding substitution-compounds of diazobromobenzolimide are obtained. 
Ethyldiazobromobenzolimide, 
G 2 h 5 
solidify even when cooled much below 0° C. 
|N, forms a yellowish oil which does not 
Phenyldiazobromobenzolimide, 
crystals. 
(€ 6 H 3 BrN 2 )"-l 
€ 6 H 5 J 
N, is obtained in the form of orange 
REMARKS ON THE PRODUCTS OE DECOMPOSITION OF THE COMPOUNDS OF 
DIAZOBROMOBENZOL. 
The great similarity existing between the properties of the diazobromobenzol-com- 
pounds and those of the corresponding abromous bodies, is likewise encountered in 
their products of decomposition obtained under similar circumstances ; and I have 
therefore generally abstained from verifying the latter by analysis, having restricted 
myself to bringing forward analytical numbers in a few cases only. 
On heating an aqueous solution of nitrate or hydrobromate of diazobromobenzol, 
5 a 2 
