116 
DR. A. W. HOFMANN’S RESEARCHES REGARDING THE 
bromic and oxalic acids; when heated with water, they form an oily layer on the sur- 
face, and crystallize only slowly on cooling : they have the peculiar fatty appearance 
which characterizes the crystalline amyl-compounds. The platinum-salt is precipi- 
tated as a yellow mass of an unctuous consistence ; it crystallizes but very slowly, 
and usually not before partial decomposition has set in. It is on this account that I 
have not made an analysis of this compound. 
Action of Bromide of Amyl upon Amylaniline. 
Diamylaniline ( Diamylojjhenylamine) . 
A mixture of amylaniline and bromide of amyl solidifies after two days’ exposure 
to the temperature of the water-bath. The new basic compound, when separated and 
purified in the usual manner, resembles the preceding base, especially with respect to 
odour. Its salts are so insoluble in water that at the first glance one is almost in- 
clined to doubt the basicity of the substance, inasmuch as the oil appears to be per- 
fectly insoluble in dilute hydrochloric and sulphuric acids. However, the oily drops 
floating in the acid solution are the salts themselves, which gradually solidify into 
splendid crystalline masses, having likewise the fatty appearance of amyl-substances. 
The composition of diamylaniline is represented by the expression — 
^32 ^27 ^ — ^ 12 '' 
r H, 1 
^10 Hii' 
C,„ H„ 
II 
^10 
[Cjo Hji, 
■ ^12 H 5 
I have established this formula by the analysis of the platinum-compound, which is 
precipitated as an oily mass, rapidly solidifying into a brick-red crystalline substance. 
If an alcoholic solution of the hydrochlorate be employed, it is immediately obtained 
in the crystalline state. When exposed to the heat of the water-bath this salt fuses, 
without however undergoing any decomposition. 
On analysis the following results were obtained : — 
I. 0’3015 grm. of platinum-salt gave 0*4820 grm. of carbonic acid, and 0*1765 grm. 
of water. 
II. 0*2550 grm. of platinum-salt gave 0*0572 grm. of platinum. 
III. 0*4750 grm. of platinum-salt gave 0*1061 grm. of platinum. 
Percentage. 
^ , 
I. II. III. 
Carbon 43*60 
Hydrogen 6*50 
Platinum 22*43 22*34 
The formula 
C 32 H 27 N, H Cl, Pt CI 2 
