WHICH NITROGEN IS SUBSTITUTED FOR HYDROGEN. 
717 
T0565 grm. of substance gave 02887 grm. of platinum. 
€ 10 H 6 N 2 , HC1, Pt a 2 . 
Calculated. Found. 
Platinum . . . 2 7 '40 per cent. 27*33 
Diazonaphtolimide, ^ 10 j-N, 
passes over as a yellowish-coloured oil (which becomes brown when exposed to the air) 
by distilling with water the substance obtained by the action of ammonia upon the per- 
bromide. It possesses somewhat the odour of naphtaline. 
OBSERVATIONS ON THE PRODUCTS OF DECOMPOSITION OF THE DIAZONAPHTOL 
COMPOUNDS. 
After being convinced that the products of decomposition of the diazonaphtol com- 
pounds so much resembled those of the other diazo-bodies, I could not entertain for a 
moment the intention of pursuing their study in all directions, especially since known 
bodies would frequently have formed the subject of such study. The decomposition of 
the perbromide, for instance, by means of alcohol gives rise to the formation of bromo- 
naphtaline, that of the platinum-salt when ignited with carbonate of sodium to the 
formation of chlornaphtaline. I thought it, however, of sufficient importance to ascer- 
tain whether nitrate of diazonaphtol would split up according to the equation 
€ 10 H 6 N 2 , NH0 3 +H 2 0=0 1O H 8 0+N 2 +NH0 3 , 
since the possibility of obtaining the long-sought-for naphtyl-alcohol presented itself. 
On boiling the solution of the nitrate of diazonaphtol, an immediate evolution of gas 
takes place, and a viscid violet-brown mass separates which remains on the filter when 
the solution is. filtered hot. 
The filtrate deposits generally small white plates, retaining, however, a portion of 
the substance dissolved, which can be recovered by shaking the aqueous solution with 
ether. On evaporating the ether it remains behind as a violet-coloured oil which 
quickly solidifies. This latter, as well as the plates first deposited, is in fact almost 
pure naphtyl-alcohol, whilst the violet-brown mass on the filter contains, besides naphtyl- 
alcohol, a considerable quantity of a reddish-brown body. In order to purify the 
naphtyl-alcohol, the united portions are treated with a cold solution of potassa, the 
residuary brown-red body* is filtered off, and the filtrate treated with acetic acid as 
long as precipitation ensues. Naphtyl-alcohol separates first as an oil, soon solidifying 
to a network of small plates, which are still somewhat violet-coloured. They are thrown 
on a filter, washed with cold water (which removes the mother-liquor), and then submitted 
to distillation. 
* This body is soluble in alcohol, to. which it imparts a blood-red colour. On concentrating the alcoholic 
solution, reddish-brown indistinct crystals are deposited, which, on rubbing, acquire a green metallic lustre. 
5 c 2 
