140 C. L. Jackson—Methyl and Benzyl Compounds. 
Nitrate of Methyl Selenide.—This substance can be purified by 
recrystallization from pure water or alcohol. Its formula is 
either (CH ,),Se(NO,)OH or (CH,),Se(NO,).(CH,),SeO, but 
the percentages from these two formule are so nearly the same, 
that it was imposible to ah from the analysis which was the 
right one. It crystallizes in long white prisms with a slight 
odor, which melt at 90°5° (uncorr.), and are extremely soluble 
in water, less so in alcohol, but freely soluble in hot, insoluble 
in ether. 
Chloride of Methyl Selenide nit ),SeCl, was formed by pre- 
d. 
cipitating the nitrate with rochloric acid. Tt can be puri- 
fied by crystallization from xlcabok 
Calculated for (CH3).SeCl.. Observed. 
OnTOrmes 6650. 2 39°66 39°02 38°82 
It forms large white very thin scales with a pearly luster and 
disagreeable odor. Melting point59%5° (uncorr.). It is slightly 
in water and ether, very soluble in alcohol and in 
Ay spores acid. 
omide of Methyl Selenide (CH,),SeBr, was prepared like 
the sibs using hydrobromic instead of. hydrochloric acid. 
The yellow precipitate was washed with cold water and re- 
crystallized once out of hot alcohol. 
Calculated #8 i ied Observed. 
PONTE os se - 59°95 
It forms very thin ee crystalline plates, with a 
pearly luster and very disagreeable odor, melts under decom- 
position at 82° (uncorr.); 1s less so fable in water than the 
would seem that the compound was disassociated accordin ng to 
the following reaction 
(CH,),SeBr, =(CH,),Se+Br,, 
and that on cooling it was regenerated, while the heat given off 
by the combination volatilized a portion of the methylselenide, 
and the bromine thus left free colored the alcohol brown. 
This view is supported by the fact that — s)aseBr, can be 
made by direct combination of (CH,),Se Br bromine, much 
heat being evolved in the process. On unt of this prop- 
erty, crystallization of the eben of soeibipionkehide from alco- 
hol is always attended with loss. The substance is insoluble in 
ether. 
Iodide of Methyl Selenide (CH,),Sel, was formed when aque- 
