332. = Friedel and Crafts on the Ethers of Silicie Acid. 
4th distillation. Sth distillation. 
BION 1988 a as canits POG Rs Saeen dis 6°5 grs. 
BOB. 205 ccwcaned. 4B i i winwams $5." . i= 18'26 pe 
205 -215 1.60.00 70. ©. ncwenenes | le 
215-290: 5 -weecdewias SB ore a au ark eoieewcs o2.* 
230 =240 ccs nnsves Dna ts aces 50 “* §i==19°50 p.c. 
BAO. 288s oinsc's sy This: aire daw 6:5 :* 
45°5 44:0 
The portion distilling above 200° in vacuo, and that which 
distilled above ° under a pressure 58-60 mm., were redis- 
tilled three times under a pressure of 9-10 mm. 
220°-235° ..... 5°0 grs. Si==20°60, C—37:01, H=764 p. & 
235 -245 ..... 2:2 “ §i==20°99 per ct. 
245 =280 = ....: wor sro * « 
Finally, the portion remaining above 280°, was distilled un- 
der a pressure of 1-3mm. 
DP eB NOs | A¥ < Gli Acs ns.ednecdee 1-0 grs, 
SRO HBG Gs 0F 5 kaw siermrermrierionrers 3:0.  . Six 22°79 per ct. 
Sheed G6 es tsk ions cee uns 2-1. % . Si==23.91.. 
The formula of Ebelmen’s bisilicate requires 20-90 per ct. Si. 
The quadrisilicate 28°66 per ct. Si. 
_ We made other distillations of the higher products in vacuo, 
analyzing the liquid, which passed at different temperatures, 
and found the results to agree with the foregoing. if 
hus after a very prolonged series of fractionated distilla- 
tions, we not only failed to obtain the bisilicate among the pro- 
ducts distilling in the neighborhood of its supposed boiling 
point, but we also failed to isolate any body having a definite 
composition and a constant boiling point. The proportion of 
ilica in these condensed ethers increases with the temperature, 
at which they distill, while that of carbon and hydrogen dimin- 
ishes, and the relations between these constituents do not lead 
to any simple formula. Products from different preparations. 
having the same boiling points have nearly the same compo 
sition. 
It is probable that there are several condensed silicates be- 
longing to some of the types mentioned (p. 166) and that they 
can not be oa dg by distillation. It is worthy of notice that 
in all the bodies analyzed the ratio of carbon to hydrogen 18 
the same as in the radical ethyl. 
We attempted to prepare the bisilicate by 
exactly the ae i 
some 
