738 
MR. C. GEEYILLE WILLLOIS OX SOIME OE THE PEODrCTS 
On the crude bromine compound being separated and distilled, all the benzole and 
radicals will distil away, lea\ing the brominated oil, the boiling-point of which is much 
higher. We are not acquainted with any process for separating benzole from the radi- 
cals in. such a manner as to yield the former pure, but by treatment with fuming nitric 
acid, in the manner described in Part I., the benzole is transformed into the nitrocom- 
pound, from which the propyle may be obtained by distillation on the water-bath. 
It was necessary to ascertain whether the nitrocompound obtained by treating with 
nitric acid the fluid distilling away from the brominated oil, contained any substance 
(save nitrobenzole) capable of forming alkaloids by reduction. On treatment by 
Bechamp’s process, it yielded a considerable quantity of base ha^ung all the characters 
of aniline, and distilling at 182°. 
To confirm this result a portion was dissolved in hydrochloric acid, and to the solution 
was added about a third of the quantity of bichloride of platinum necessary to precipitate 
the whole of the base in the state of platinum salt. The precipitate being filtered off, 
a fresh quantity of the bichloride was added, and so on until three precipitates were 
obtained. They were washed with a mixture of alcohol and ether previous to diAfing. 
I. '5197 gramme of the first precipitate gave ’4726 carbonic acid and T359 water. 
II. -2980 gramme of the first precipitate gave ‘0972 platinum. 
III. -5196 gramme of the second precipitate gave -4668 carbonic acid and T359 water. 
IV. -3408 gramme of the second precipitate gave T112 platinum. 
V. ’3447 gramme of the third precipitate gave T128 platinum. 
Or, per cent. — Experiment. Calculation. 
^ __A ^ , A 
1st precip. 2nd precip. 3rd precip. 
Carbon . . . 24-5 24-5 C*" 72-0 24-0 
Hydrogen . . 2‘9 2'9 8'0 2'7 
Nitrogen N 14-0 4-7 
Chlorine C? 106-5 35*6 
Platinum . . 32-6 32-6 32-7 Pt 99-0 33-0 
• 299-5 100-0 
It is evident, therefore, that the aniline procured in this manner is almost pure, the 
only admixture being a small portion of toluidine ; and it may with safety be con- 
cluded that benzole is the only hydrocarbon (distillmg a-way from the brominized oil) 
which forms a nitrocompound capable of reduction by protacetate of iron. 
If the bromine compound obtained from the naphtha boiling between 71° and 77° be 
distilled, a thermometer being in the tubulature of the retort, no constant boiling-point 
will be obtained until a temperature of 123° is reached. This ai-ises fi-om the tenacity 
with which the oil retains benzole and the radicals. It was only after much labour and 
numerous analyses that this source of difficulty was discovered, and precautions taken to 
prevent its interfering with the isolation of the hydrocarbons to be presently described. 
If the heat be very gradually applied to the retort, ebullition Avill commence at about 80°, 
