104 
DR. A. W. HOFMANN’S RESEARCHES REGARDING THE 
maiiiing perfectly bright and colourless when exposed to the air. Like ethylaniline 
it still imparts a yellow colour to fir-wood, but, like the former, fails to affect a solu- 
tion of hypochlorite of lime. 
Analysis performed with protoxide of copper gave the following results : — 
0’2301 grm. of oil gave 0’6814 grm. of carbonic acid and 0‘2118 grm. of water. 
The formula 
^20 1^15 ^ 
requires the following values, which may be placed in juxtaposition with the per- 
centage deduced from the above analysis. 
Theory. 

Experiment. 
20 equivs. of Carbon .... 
120 
80-53 
80-76 
15 equivs. of Hydrogen . . . 
15 
10-06 
10-22 
1 equiv. of Nitrogen .... 
14 
9-41 
1 equiv. of Diethylaniline . . 
149 
100-00 
To obtain farther evidence for the formula of this compound, both the hydrobromate 
and the platinum-salt were subjected to analysis. 
Hydrobromate of DiethylaniUne. 
I have mentioned this salt when speaking of the formation of the second base. It 
is extremely soluble, and resembles in every respect the corresponding ethylaniline- 
compoimd. The bromine-determination gave the following results : — 
0-4277 grm. of salt gave 0‘3490 grm. of bromide of silver. 
I place the experimental percentage of hydrobromic acid in juxtaposition with the 
theoretical value of the formula 
C 20 N, H Br. 
Theory. Experiment. 
^ 
1 equiv. of Diethylaniline 149 64-78 
1 equiv. of Hydrobromic acid 81 35’22 35'14 
1 equiv. of Hydrobromate of Diethylaniline 230 100 00 
The hydrobromate of diethylaniline, when gently heated, fuses and sublimes like the 
corresponding aniline- and ethylaniline-salts. When rapidly heated, it is entirely 
converted into a colourless oil, which distils over. This oil contains equal equiva- 
lents of bromide of ethyl and ethylaniline. By this distillation we obtain indeed the 
very constituents from which the hydrobromate was originally prepared, and which 
would of course reeonvert themselves into hydrobromate of diethylaniline. Only a 
trifling amount of undecomposed hydrobromate covers, after the distillation is finished, 
the sides of the retort in the form of a radiated coating. 
The peculiar deportment then of the hydrobromates of the ethyl-bases, and pro- 
bably of all their salts, allows us to remove the several equivalents of ethyl one after 
