Dr. Hofmann on Derivatives of Phenylamine and Ethylamine. 233 
stalline substance. This may be further purified by repeated crystal- 
lizations from diluted alcohol. 
Analysis, in fact, assigns to this body the formula 
(C, H,)" 
C,, Ls N= (C,, H,), Na 
Hi, 
which was confirmed by the analysis of the dichloride— 
(C, 1 ty ” 
(C,. Hs). ¢ Na | CL, 
H, 
and of the platinum-salt— 
(C, H,)” ” 
(C,,H,), +N, | Cl, 2Ft Cl,. 
By 
The formation of the new body is obvious: 
C,H. . (C, H,)” H, 
Z| [ 12 nt} N | +(C, H,) Bri=(C., Bs), N,+2 ba 1K J : Lig 
pe 
Phenylamine. Dibromide of | Ethylene- Bromide of 
E hylene. diphenyl- Phenyl-ammonium. 
diamine. 
This substance differs in its physical characters essentially from 
the base containing 2 molecules of ethylene. The former is very 
soluble in alcohol and ether, the latter being very difficultly soluble ; 
its fusing-point is 59°, the fusing-point of the latter being 157°. 
In order finally to establish the relation between the body which 
forms the subject of this note and the base previously described, it 
remained to prove experimentally that the former, when submitted 
to the action of dibromide of ethylene, may be readily converted into 
the latter. Nothing is easier than to accomplish this transforma- 
tion, which, in the presence of alcohol, is rapidly effected at the 
temperature of boiling water. 
Treatment of the product of digestion with water removes the 
dichloride of ethylene-diphenyl-diammonium, the diethylene-diphe- 
nylamine remaining dissolved in the excess of dibromide of ethylene, 
from which it may be readily extracted by hydrochloric acid. 
Preparation of the substance in a state of purity, and comparison 
of its properties with those of the body previously obtained, esta- 
blished beyond a doubt the transformation, which resolves itself into 
a simple process of substitution— 
(C, H,)” hi (C, H,)” 4 
Cun), x. +(CH)'Br= (GPs } bx iG Ht), x,| Br, 
2 4 
