712 
ME. P. GEIESS ON A NEW SEEIES OF BODIES IN 
in cold, readily in hot alcohol and ether. It crystallizes from these solvents in long 
almost white needles, which fuse at 126° C., and which possess the odour of nitrobenzol. 
A bromine-determination gave the following results : — 
0-3355 grm. was ignited with lime and gave 0-317 grm. of bromide of silver. 
€ 6 H 4 (N0 2 )Br. 
Calculated. Found. 
Bromine .... 39-61 per cent. 40-19 
If the perbromide of /3 diazonitrobenzol is decomposed in a similar manner with 
boiling alcohol, and the solid product of decomposition which forms purified as described 
before, a compound is obtained to which the formula 0 6 H 4 (N0 2 ) Br must likewise be 
assigned, which, however, differs greatly in its physical appearance and properties from 
the former bromonitrobenzol. It crystallizes from alcohol and ether, in which it seems 
to be more easily soluble, in the form of well-made, slightly yellowish, or almost white 
rhombic prisms, sometimes also in plates, and fuses at 56° C., or 70° below the fusing- 
point of the bromonitrobenzol derived from the a compound. The analysis of this body 
gave the following results : — 
0-2745 grm. of substance gave 0-361 grm. of carbonic acid and 0-0535 grm. of water. 
0-3365 grm. of substance gave, on ignition with caustic lime, 0-3145 grm. of bromide 
of silver. 
Calculated. 
Found. 
^6 
72 
35-64 
35-87 
H 4 
4 
1-98 
2-16 
Br 
80 
39-61 
39-77 
N 
14 
6-93 
— 
0 2 
32 
15-84 
— 
202 
100-00 
The existence of these bromonitrobenzols suggests the question whether one of them 
be not identical with the bromonitrobenzol prepared by Coupee by the action of 
fuming nitric acid upon bromobenzol. Coupee’s description of this body appeared to 
me scarcely conclusive of its nature ; and in order to decide this question I have treated 
bromobenzol, prepared from coal-tar naphtha, with fuming nitric acid, and have com- 
pared the perfectly pure product, after repeated recrystallizations from alcohol, with the 
bromonitrobenzols prepared by my method. The striking coincidence between the 
crystalline form of Coupee’s compound and of the bromonitrobenzol corresponding to 
the a, nitraniline, which I will now call a bromonitrobenzol, became at once perceptible ; 
and since both compounds crystallize in white needles that could by no means be 
distinguished from one another, I felt justified in coming to the conclusion that both 
are identical. In order, however, to make quite sure I have also determined the fusing- 
point of the respective compounds, and have found it uniformly at 120° C.* 
* Coupee states (Ann. de Chim. et de Phys. [3] vol. lii. p. 309) that his compound fused below 90° C. This 
is evidently erroneous. 
