462 R. ROBINSON AND H. G. SMITH. 
The colour reaction with concentrated sulphuric acid 
was almost exactly the same as that described for dichlor- 
eudesmin (see above). Bromine in carbon disulphide 
solution leaves this substance unchanged under ordinary 
conditions, but, if a solution containing the bromo derivative 
and bromine is placed in a quartz vessel in the sunlight, 
reaction occurs and the bromine is very slowly absorbed. 
Hven in this case, however, hydrobromic acid is produced 
and the action is evidently one of further substitution. 
DILODOEUDESMIN, (CONSTITUTION CORRESPONDING TO THAT 
OF DICHLOREUDESMIN). 
Iodine does not attack eudesmin, and in order to produce 
an iodo derivative, recourse was had to the action of iodine 
monochloride. The yield of this compound was, however, 
not so satisfactory as that of the chloro and bromo deri- 
vatives. 
Eudesmin (5 gr.) dissolved in acetic acid (50 ccm.) was 
gradually treated with 50 ccm. of an acetic acid solution 
of iodine monochloride (containing 64 grs. IC] in 500 ccm. 
acetic acid) and the whole then heated on the steam bath 
during half an hour. The mixture was then treated with 
excess of aqueous sulphurous acid and the sticky residue 
dissolved in acetic acid. After standing overnight in the 
ice chest feathery needles were found to have separated, 
and these were collected and recrystallised from ethyl 
acetate. The colourless needles were sparingly soluble in 
organic solvents with the exception of chloroform and 
melted without decomposition at 175°. 
0°1113 gave 0°0824 AgI. I = 40°0 
CooHosOel2 requires I = 39°8 per cent. | 
The substance is similar in most of its properties to the 
previously described bromo derivative, but, on treatment 
with nitric acid it loses its iodine as such. Iodine in the 
elementary condition is also observed as a momentarily 
