344 = Friedel and Crafts on the Ethers of Silicte Acid. 
Below 119°) wi ceadwies coins es ot dees 2 gr. 
UE eh ser 2 rere ean eee a eee _ dade 
pe es Cee eee ee ee ee ee ee a 
12 66 
All these portions below 140° burnt with a green flame and did 
not contain a notable quantity of silica. They consisted in 
Ebelmen’s boric ether in a state of almost complete purity. The 
true boiling point of this ether is 119°. 
The portion 119°-125° was analyzed. 
Substance, weight, - - - - 0°2105 gr. 
Oe aed ce 
eis He eS ct) ee hs 01990." 
Theory. 
Bo(€2H,),03 
€, 49°19 49°31 
H, 10°51 10:27 
acid by boric. The products boiling higher than 140° consisted 
acid aets on silicic ether in the same manner as water, and nob 
like anhydrous aeetic acid. It is possible that this reaction may 
serve as a means of preparing some of the ethers of other acids 
that have not yet been obtained. : 
From all the facts observed in this research, the tetratomic 
character of silicium appears to us proved in the most convin- 
cing manner. It is impossible to find simpler formule to repre- 
sent the composition of the monochlorhydrines and trichlorhy- 
drines of ethylic and methylic silicic ethers, or of the mono- 
amylic-triethylic, monoethylic-trimethylie and monoethylic-tri- 
ethylic ethers, or of the acetine; and only by returning to the 
old atomic weight of oxygen, can the hexethylic and hexam- 
ethylie-disilicic ethers be written with a simpler formula, since 
they contain 6,. 
e existence of these compounds and their formule is inter- 
preted most readily by supposing, as we have done, that t 
chlorid of silicium, Si Cl,, silicic acid, Si@,, and the silicic hy- 
drate SiH, ©, act in the same way as the polybasic acids known 
in mineral and organic chemistry. 
In another paper we intend to publish the results, that we 
have obtained in studying the compounds of silicium with the 
alcoholic radicals. 
Boston, Dee. 5th, 1866. 
