694 
ME. P. GEIESS ON A NEW SEEIES OF BODIES IN 
In order to decompose larger quantities of the perbromide of diazobenzol in this manner, 
it is likewise requisite to mix it first with a sufficient quantity of carbonate of sodium, 
to avoid a violent explosion. 
By heating the mixture in a retort bromobenzol is obtained almost perfectly pure. 
The perbromide, when heated with alcohol, likewise gives rise to a decomposition in 
accordance with the previous equations. Bromobenzol separates as a heavy oil on the 
addition of water to the alcoholic solution. 
It deserves to be mentioned that all these reactions are very well defined, and that 
the amount of the products of decomposition corresponds almost theoretically with the 
quantities employed. 
Appendix. 
It may be of some interest to mention an experiment I made to obtain ethylated 
diazobenzol compounds. For this purpose I submitted nitrate of ethylaniline to the 
same reaction which produced from nitrate of aniline the nitrate of diazobenzol. I 
obtained a body crystallizing, like the latter, in long needles. If this body had really 
been nitrate of ethyldiazobenzol, I expected to obtain, by boiling with water, a reaction 
according to the equation 
e 6 h 3 (g 2 h 5 ) n 2 , nho 3 +h 2 o=g 6 h 5 ( g 2 h 5 ) g+ nho 3 +n 2 . 
v — J K — — v~ J 
Nitrate of ethyldiazobenzol. Ethylphenylic acid. 
It soon became evident, however, that the oily body produced was nothing else than 
ordinary phenylic acid ; and since no other organic product of decomposition could be 
traced, I had to come to the conclusion that the above-mentioned crystals were nothing 
else than ordinary nitrate of diazobenzol. In order to decide this question the gold-salt 
was prepared, and, after being purified by recrystallization from alcohol, the well-known 
golden, brilliant crystals were obtained, which gave, on analysis — 
0-759 grm., decomposed by sulphuretted hydrogen and ignition of the tersulphide of 
gold, left 0-337 grm. of gold. 
G 6 H 4 N 2 , HC1, Au Cl 3 . 
Calculated. Found. 
Gold . . . 44-37 44-40 
The compound G 6 H 3 (G 2 H 5 ) N 2 , HC1, AuC 1 3 , requires 41*74 per cent, of gold. 
The action of nitrous acid upon nitrate of ethylaniline may therefore be expressed by 
the equation 
G 6 H 6 (G 2 H 5 )N, nh o 3 +nho 2 =g 6 h 4 n 2 , nho 3 +g 2 h 6 o+h 2 G. 
Nitrate of ethylaniline. Nitrate of diazobenzol. Alcohol. 
