J. M. Crafts on Ethers of Arsenic Acid. ‘79 
ARSENITE OF METHYL. 
The arsenite of methyl was prepared by heating dry arsenious 
acid with the silicate of methyl for 12 hours at 160°, and very 
neay ae theoretical quantity was obtained. 
I also obtained by the action of iodid of methyl on 
gsinite of silver in a sealed tube. The reaction does not take 
place at a temperature lower than 150°, and at that tempera- 
ture a considerable part of the arsenious ‘ether is destroyed, so 
that the first eked of preparation is to be preferred. 
e arsenite of methyl boils at 128°-129° (no correction). 
L a 4990 grms.; Co,=0°3966 grms. ; H,0O=02442 
uw’ ge ae 3725 grms ; As,O;=0°2525 grms. 
The arsenic determination was made by decomposing the 
ether with water, oxydizing with nitric si evapo © and 
combining the arsenic acid with oxyd of le 
Lt Calculated for (CH3 0: 
C=91°67 oe pa a tte 
iss Sabi ee Seas 
reer: 449] 44-64 
The density of liquid of arsenite of methyl at 9°°6 compared 
wh that of water at 4°=1:428. The vapor density was dleter- 
ined from the following data : 
Difference between weights o bulb=0°5265 grms. 
Temperature of the balance : 
=16° 
Temperature of the oilbath (air- -thermometer) = =197° 
Capacity of Me bulb, =1615 cc. 
Air remaining = ldeac 
Vapor diate 006 Theory=5°818 
_ The determination probably pene out too high on account 
_ of the decomposition of a small quantity of ether by the 
- moisture of the air. 
The arsenite of methyl resembles the arsenite of ethyl in its 
pr ies. It is decomposed immediately by water and also 
by the moisture of the air with formation of arsenious acid and 
methylie alcohol. 
endeavoring to to obtain the chlorhydrines of these ethers a 
* This Journal, IL, xhii, p. 155 and 331. 
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