WHICH NITEOG-EN IS SUBSTITUTED FOE HYDEOG-EN. 
705 
Diazodibromobenzolimide , 
(G 6 H 2 Br 2 NJ'| N 
This compound is easily obtained in crystals by mixing the perbromide, 
€ 6 H 2 Br 2 N 2 , HBr 3 , 
with ammonia. Kepeated recrystallization from hot alcohol yields it in the form of 
white needles, which fuse at 62° C., and which detonate slightly at a higher temperature. 
It is very little soluble in water, more soluble in hot alcohol, and very readily so in ether. 
DIAZOCHLOEOBENZOL COMPOUNDS. 
Perfect analogy exists between these bodies, as well as between the diazodichlo- 
robenzol compounds, and the compounds I have just described, with regard not only to 
the modes of preparation from chlorine and dichloraniline, but also in respect to their 
various physical properties. I therefore abstain from entering into a minute description, 
and will simply enumerate some few experiments, which I hope will satisfactorily prove 
their great similarity. 
'Nitrate of Diazochlorobenzol, G 6 H 3 C1N 2 , NH0 3 . 
This substance crystallizes in small white plates, which yield on boiling with water 
chlorophenylic acid in the form of a brownish oil possessing the odour of creosote. 
Perbromide of Diazochlorobenzol, C 6 H 3 Cl N 2 , HBr 3 , 
forms yellow columns which are decomposed in boiling alcohol with formation of 
bromochlorobenzol, the composition of which is thus expressed, 0 6 H 4 Cl Br *. 
0-2005 grm. of the perbromide was decomposed with ammonia, and when precipitated 
with nitrate of silver gave 0-2952 grm. of bromide of silver. 
€ 6 H 3 C1N 2 , HBr 3 . 
Calculated. Pound. 
Bromine .... 63-24 62-64 
Platinum-salt of the Hydrochlorate of Diazochlorobenzol, C G H 3 C1N 2 , HC1, PtCl 2 , 
forms fine yellow needles. On heating with carbonate of sodium it yields dichloro- 
benzol, which is obtained, according as it crystallizes slowly or rapidly, in long fine 
needles, or in elongated four-sided plates, possessing the same peculiar aromatic odour 
as the dibromobenzol. 
Diazochlorobenzolimide, (G 6 H 3 Cl N 2 )"l 
H 
N, forms readily fusible crystals. 
* I leave it undecided whether the bromochlorobenzol thus obtained is identical with the body described on 
page 702 as derived from C 6 H 3 BrN 2 , HC1, PtCl 2 , and possessing the same elementary composition. Some 
observations, which shall be fully described when treating of the products of decomposition of diazonitrobenzol, 
do not favour the view of their identity. 
