678 
MR. P. GRIESS ON A NEW SERIES OF BODIES IN 
COMPOUNDS OF DIAZOBENZOL WITH ORGANIC BASES. 
Diazo-amidobenzol, as is well known, is formed by the action of nitrous acid upon an 
alcoholic solution of aniline, according to the equation 
2C 6 H 7 N+NH0 2 =€ 12 H n N 3 +2H 2 O. 
Aniline. Diazo-amidobenzol. 
By viewing this body as a double compound of diazobenzol and aniline, 
€ 12 H u N 3 = 
f€ 6 H 4 N 2 
1c 6 h 7 n ’ 
I was led to prepare it by the direct action of aniline upon compounds of diazobenzol. 
This reaction proceeds readily on mixing an aqueous solution of nitrate of diazobenzol 
with aniline, when a viscid yellow mass is speedily produced, which becomes crystal- 
line after a short time, and which can be obtained in a perfectly pure state by several 
recrystallizations * from alcohol. The formation of the diazo-amidobenzol may be ex- 
pressed as follows : — 
€ 6 H 4 N 2 , NH0 3 +2€ 6 H 7 N=€ 12 H n N 3 +€ 6 H 7 N, NHG 3 . 
Nitrate of diazobenzol. Aniline. Diazo-amidobenzol. Nitrate of aniline. 
On referring to the equation given on page 669 for the formation of nitrate of diazo- 
benzol from diazo-amidobenzol, 
€ 12 H n N 3 -f NH0 2 + 2NH0 3 =2(0 6 H 4 N 2 , NH0 3 )+2H 2 0, 
it is seen that these two bodies may be readily transformed into one another. 
Many other bases deport themselves with nitrate of diazobenzol exactly like aniline, 
and we may therefore look forward to the discovery of a large number of double com- 
pounds analogous to diazo-amidobenzol. 
It is not my intention to give a full history of these compounds, as a few short state- 
ments will show clearly how closely they are allied to their prototype diazo-amidobenzol. 
H N ) 
Diazobenzol-amidobromobenzol, < ® TT 4 
(0 6 H 6 Br Nj 
This compound is obtained by the action of bromaniline upon nitrate of diazo- 
benzol. It crystallizes in very tine small yellow plates or needles, which are rather diffi- 
cultly soluble in alcohol, but readily soluble in ether. Its platinum-salt, 
€ 12 H 10 BrN 3 , H 2 C1 2 , 2PtCl 2 , 
is obtained as a buff-coloured precipitate consisting of tine hair-like crystals. Nitrate of 
silver produces, in an alcoholic solution, a yellow precipitate similar to that of the com- 
pound previously described. 
Any excess of aniline must be removed by means of acetic acid before crystallization. 
