120 
DR. A. W. HOFMANN’S RESEARCHES REGARDING THE 
is found to be either neutral or even of an acid reaction, and to contain hydrobro- 
mate of ethylamine, which may be separated, by distillation with potassa, with all the 
properties enumerated by M. Wurtz. I have not to add a single word to the accurate 
description of this distinguished chemist, and will here only give the analysis of a 
platinum-salt prepared with ethylamine which had been obtained by this process: — 
0'2521 grm, of platinum-salt gave 0‘0992 grm. of platinum. 
The formula 
C4 H7N,HC1, PtCl2 
requires the following values : — 
Theory. Experiment. 
1 equiv. of Ethylamine . . . 
45*00 
17-91 
1 equiv^ of Hydrochloric acid . 
36*50 
14*55 
2 equivs. of Chlorine .... 
70*00 
28*24 
1 equiv. of Platinum .... 
98*68 
39*30 
1 equiv. of Platinum-salt . . . 
260*18 
100*00 
The production of ethylamine in this reaction is absolutely analogous to that of 
ethylaniline ; it is represented by the equation 
ri3N+C4H5Br=C4 H7N,HBr. 
Formation of Dietkylamine {Diethylammonia). 
On treating an aqueous solution of ethylamine in the same manner with an excess 
of bromide of ethyl, phenomena of a perfectly analogous character are observed. The 
reaction however proceeds more rapidly and is terminated after a few hours’ ebulli- 
tion. The aqueous layer, which assumes a bright yellow colour, deposits acicular 
crystals on cooling, consisting of the hydrobromate of a new base, for which I pro- 
pose the name diethylamine or diethylammonia. This base may be readily separated 
by distillation with potassa, when it passes over in form of a very volatile and in- 
flammable liquid, which is still extremely soluble in water and of a powerful alkaline 
reaction. When dissolved in hydrochloric acid and mixed with a concentrated solu- 
tion of bichloride of platinum, it yields a very soluble platinum-salt, which crystallizes 
in orange-red grains, very different from the orange-yellow leaves of the correspond- 
ing ethylamine-salt. 
The analysis of this platinum-salt shows that diethylamine may be viewed as 
ammonia, in which 2 equivs. of hydrogen are replaced by 2 of ethyl. 
0 '2250 grm. of platinum-salt gave 0T430 grm. of carbonic acid, and 0*0890 grm, 
of water. 
0*3413 grm. of platinum-salt gave 0*1210 grm. of platinum. 
These numbers agree exactly with the formula 
Cg Hii N, H Cl, Pt CI2, 
