on the Iodide of Acetyle. 545 
same treatment, would give the terbromide of acetyle (C* H Br’), 
and also whether or not this body, should I obtain it, would give 
; 3 
the glycerine of the acetyle series of compounds C4 Ho + O* 
To prepare the terbromide of acetyle, 1 equivalent of the iodide 
of acetyle is treated with 3 equivalents of bromine. As a great 
deal of heat is evolved during the reaction, the iodide must be 
introduced into a long tube surrounded with a mixture of ice 
and salt, and the bromine very gradually added to it. Iodine 
is set free in large quantity, communicating a dark red colour to 
the liquid, and separating from it on standing in large brilliant 
erystals. As soon as all the bromine has been added, the tube 
is agitated for some time, still retaining it in the freezing mix- 
ture, then sealed and exposed to the temperature of 100° Cent. 
for about 12 hours. At the expiration of this time it is opened*, 
and the contents washed with dilute potash in order to remove 
the free iodine. Finally, to complete the reaction, it is boiled 
for a few minutes with a little free bromine, washed again with 
potash, and subjected to distillation, reserving the portion which 
passes over between 185° and 190° Cent. With the exception of 
a few drops, the entire liquid distils over at this temperature, 
The reaction which takes place is exceedingly simple: the three 
equivalents of bromine combine with the radical C* H°, displacing 
the 1 equivalent of iodine. 
The liquid thus prepared is usually of a beautiful rose tint, 
from the presence of a trace of free iodine; it can, however, be 
obtained colourless. It has a sweet taste and agreeable fragrant 
odour, recalling that of chloroform. It is insoluble in water, 
but freely soluble in alcohol, ether, and acetic acid. It boils at 
about 186° Cent., and is remarkably heavy, having a specific 
gravity of 2°663 at 0° Cent. Its composition is C+ H® Br°, as 
proved by the following analyses. 
I. 05967 grm. of the fluid gave 02000 grm. carbonic acid 
and 0:0687 grm. water. 
IL. 0°4989 grm. of the fluid gave 0°1660 grm. carbonic acid 
and 0:0523 grm. water. 
III. 0°3255 grm. of fluid gave 0°6972 grm. bromide of silver. 
Per-centage composition. 
Theory. Experiment. 
hte ihn sd dd) Aaa 
4 equivs. carbon . . 24 8:99 9°14 9:07 
3 equivs. hydrogen . 38 lll 1:27 1:16 
8 equivs. bromine . . 240 89°90 KMD 
267 100:00 
* This can be done with perfect safety, as no gas is evolved during the 
heating. 
Phil, Mag. 8. 4. No. 96, Suppl. Vol. 14. 2N 
