WHICH NITROGEN IS SUBSTITUTED EOR HYDROGEN. 
689 
0*250 grin, of substance gave 06679 of carbonic acid and 0*1135 grin, of water, corre- 
sponding to 72*52 per cent, of carbon and 5*04 of hydrogen. 
0*307 grm. gave 35*7 cub. centims. of nitrogen at 0°C. and 760 millims. bar. pressure, 
= 0*04461 grm. of nitrogen, or 14*52 per cent. 
The following formula is deduced from these numbers : — 
G 12 H 10 N 2 O. 
Calculated. 
yV 
Found. 
r — 
Gl* 
144 
72*7? 
72*52 
Hio 
10 
5*05 
5*04 
n 2 
28 
14*14 
14*52 
0” 
16 
8*08 
— 
198 
100*00 
The formation of this compound may be expressed by the following equation : — 
2(G 6 H 4 N 2 , NH0 3 )+H 2 0=G 12 H 10 N 2 0+2NH03+2N. 
V v ' ' 
Nitrate of diazobenzol. New compound. 
It will be readily seen that this formula contains the elements of phenylic acid and 
diazobenzol * 
G 6 H 4 N 2 +G 6 H 6 0=G 12 H 1O N 2 0, 
and I will therefore call it phenol-diazobenzol without prejudging its rational constitu- 
tion. This body usually crystallizes from alcohol and ether (in which it is very easily 
soluble) in brittle brownish-yellow warts. It is almost insoluble in cold water, slightly 
so in boiling water, from which, on cooling, it crystallizes in small yet well-formed 
rhombic prisms of a fine yellow colour, with a tinge of violet. These crystals fuse at 
148° C. to a brownish-yellow oil, which cannot be volatilized without decomposition, 
and is destroyed at a higher temperature with formation of yellow vapour. Although 
plienol-diazobenzol has the properties of an acid, forming with certain metals saline 
compounds, its acid character is so slightly pronounced, that it is not even capable 
of decomposing carbonates. On evaporating a solution of phenol-diazobenzol with 
aqueous carbonate of potassium to complete dryness, the former will be left behind 
unaltered. Evaporated with aqueous ammonia, the whole of the ammonia is driven off. 
Treated with nitrate of silver, a scarlet-red silver compound precipitates, which appears 
specially suited to serve for the determination of the atomic weight of this compound. 
It deserves mention that phenol-diazobenzol is isomeric with azoxybenzide. The pro- 
perties just described show conclusively, however, that it has nothing in common with 
the latter compound beyond the formula. 
The second product of the above-mentioned reaction may usually be obtained per- 
* Nitrosoethyline, recently described by Gettther. and Kkeutzhage, will probably come under tbe same class 
of compounds, since its composition may be expressed by tbe addition of tbe hypothetical diazohydride of ethyl 
and alcohol, viz., 
H. N„ +€„ H ft Q=G , H in N 0 O. 
