Friedel and Crafts on the Ethers of Siliciec Acid. 331 
ArT. XXXVII.—Research on the Ethers Silicic Acid ; ty 
C. FRIEDEL and J. M. Cra 
[Concluded from p. 171.] 
The first distillations were made in vacuo (8-5 millimeters 
pressure), and the substance used consisted in residues from v 
rious preparations of the normal silicate, and of the hexethylic 
disilicic silicate; both these products had as far as possible al- 
ready been extracted. 
After eight distillations we obtained— 
at 60° ond (Centigrade.) 6 grs. of liquid. 
AG A185 Si Swesa eves Eee Lo 
135 aa eV eRe wis eee ee Vee - eg 
160 “160.2488 ed Sia: 14 “ 
106. ~160 sivdwa eves elisa sey oO: IETS = per ct. 
280 =—200 ix.o:s. 6 nwies Oijeis.576,6.0,0:08 16 *. Sie = 
BOO DRG 04 ou 0b 5 Ch ek a, 6 0 eae rea emer mn 
220. +260....\é0.0.s dan seca mie ae 8 Ree Pee ne 
260 —S00. sss skce sh eeees eee o¢ Sieeeeso de 
300 =320 00. states ina 9... Sia eS 
The largest portion within narrow limits of temperature, that. 
which distilled 165°-180°, was redistilled in the air; it com 
menced to distill at 285°, and between this point and 305°, 95 
grs. of liquid passed ; above 305° there were only 8 grs This 
last product contained 19°34 per cent Si. 
All the products distilled above, except those which had 
assed at a temperature higher than 200° in vacuo, were redis- 
tilled under the ordinary pressure. There was obtained on the 
6th distillation, 
e PIS SAIS sever is 6°5 grs. 
SAS MOSS VIC yA ete cc aes 
285 “846 Sr i cs .2..-25) “ =chexethylic disilicic ether. 
243 2260 A Oe ROS 10°0 * 
260 ~276 6 ve ee Fess isa © 
216 =286 sede aes 10°0 “ Si=17°85 per ct. 
286 -294 ......0 pci. ITO Hi 1S92 « 
294 -310 ...c%.. Fare «sik bea 
90°0 
. _ The portion of the above products containing the more con- 
densed ethers, i.e., the Me boiling 243°-310°, was redistilled 
under a pressure of 58-60mm. (=, the ordin ressure of the 
air), until the amount of f liguad “distilling at a given point re- 
mained nearly constant in successive distillations. 
There was obtained— 
