110 
DR. A. W. HOFMANN’S RESEARCHES REGARDING THE 
I have omitted to analyse it. There is however no doubt about the existence of an 
ethylobroinaniline, 
Hio Br N. 
I have not attempted to ethylate this compound any farther. 
Action of Bromide of Ethyl upon Nitraniline. 
Ethylonitr aniline {Ethylonitrophenylamine) . 
Nitraniline readily dissolves in bromide of ethyl. The solution soon deposits, even 
at the common temperature, pale-yellow crystals of considerable size. At the boiling 
temperature of water the conversion is rapidly accomplished. On addition of an 
alkali to the hydrobromate, the ethylonitraniline separates as a brown oily mass, which 
solidifies after some time with crystalline structure. In this substance, as well as in 
the other ethylated bases, the properties of the motlier-compound are only slightly 
modified. Thus we find in the base ethylonitraniline still the yellow colour of nitra- 
niline, which it readily imparts to the skin, but which it loses altogether in its salts. 
These salts are as easily soluble in water as the corresponding nitraniline-compounds, 
if not even more so, and possess the same peculiar sweetish taste ; they all crystallize 
however on evaporating their solutions nearly to dryness. Ethylonitraniline dissolves 
readily in ether and alcohol, less so in boiling water ; from a solution in the latter 
the base is deposited in stellated groups of yellow crystals, which are readily distin- 
guished from the felted mass of long needles, separated on cooling from an aqueous 
solution of nitraniline. 
I have fixed the composition of ethylonitraniline by a single number, namely, by 
the determination of the metal in the platinum double salt. This compound is pre- 
pared by adding bichloride of platinum to a very concentrated solution of the hydro- 
chlorate ; this must not contain much free acid, in which the salt would redissolve. 
After a short time pale-yellow scales are separated, which have to be washed with 
cold water. The small quantity of substance at my disposal may excuse the slight 
deficiency in the amount of platinum. 
0T544 grm. of ethylonitraniline gave 0'0405 grm. of platinum. 
This percentage agrees with the formula 
Hio N 2 O 4 , II Cl, Pt CI 2 , 
as will be seen from the following comparison : — 
Theory. 

Experiment 
1 equiv. of Ethylonitraniline . 
' 1 66-00 
44-60 
1 equiv. of Hydrochloric acid 
36-50 
9-80 
2 equivs. of Chlorine . . . 
71*00 
19-09 
1 equiv. of Platinum . . . 
98-68 
26-51 
26-23 
1 equiv. of Platinum-salt . . 
372 -I 8 
100-00 
