160 Friedel and Crafts on the Ethers of Silicic Acid. 
Its density at 0° compared with that of water at the same 
temperature =1:0483. Its vapor density was found to be 7-06. 
The theory of a condensation to two vols. requires 6:87. 
The data for the determination are: 
Difference between two weights of bulb, 1:1975 gr. 
Temperature of the balance, is 
“ “ oilb 
- - 230° 
Height of barometer, - - - - 762°8 mm. 
Capacity of bulb, - - - - 823 ce. 
Air remaining in bulb, - - - - 2 ce. 
We obtained the same chlorhydrine by heating for about one 
hour at 170°-180° one molecule of chlorid of acetyl with one 
molecule of silicic ether. The products of the reaction are acetic 
ether and the monochlorhydrine, and the reaction may be repre- 
sented by the equation: 
Si Si €.0.0 
4(€.H,) } ne ie O=3(6,H,) t Ost ©, at 
Cl 
40 grams of silicic ether, heated with 24 grams of chlorid of 
acetyl, gave 25 grams of acetic ether, nearly pure, and boiling at 
75°-80°. The theory requires 27 grams. Almost the whole of 
the remainder of the product passed at 155°-158°. : 
he experiment was undertaken with the object of obtaining 
an aceto-silicate of ethyl, supposing that the reaction would take 
place according to the equation: 
Si Si 
46,1.) } O,+ 61,0, C56 47°) } 6,+€,H,Cl, 
©,H,0 
but no trace of such a body was formed. 
The monochlorhydrine of silicic ether is also formed when 
the ether is heated with the perchlorid of phosphorus; there 1 
formation of a small quantity of oxychlorid of phosphorus and 
of other more volatile compounds containing phosphorus. A 
porca quantity of chlorid of ethyl is given off. The product ob- 
pare the triethylic mono-amylic silicic ether. See below. 
The dichlorhy f i i ' 
together one molecule of silicic ether and one molecule of chlo- 
rid of silicium. 
SiC. +4(6,H,) t oT, are [ei =| ‘ 
2 
It can also be prepared by heati hlorhydrine with 
the chlorid of siliGutn. ne oe e. 
