DERIVATIVES OF ETHYL ALCOHOL. 63 



238 ; specific gravity, 1.3264 at 0. Mixes with water 

 and is decomposed by it. 



Ethyl arsenite, (C 2 H 5 .0) 3 As, is produced by the 

 action of methyl iodide on silver arsenite; by heating 

 silicic ether with arsenious acid to 220. Colorless 

 liquid; boiling point, 166-168; specific gravity, 1.224 

 at 0. Decomposed immediately by water, arsenious 

 acid being precipitated. 



Ethyl borate, (C 2 H 5 .0) 3 B, is formed when 2 parts of 

 anhydrous borax are heated with 3 parts of potassium 

 ethylsulphate ; by the action of boron chloride on 

 absolute alcohol ; and by continued heating of boracic 

 anhydride with absolute alcohol at 110-120. Liquid ; 

 boiling point, 120 ; specific gravity at = 0.887. 

 Decomposed rapidly by water. 



Ethyl silicate, (C 2 H 5 ) 4 Si, is obtained by distilling a 

 mixture of silicium chloride and absolute alcohol. 

 Colorless liquid; boiling point, 165-168; specific 

 gravity, 0.933 at 20. Insoluble in water; is, however, 

 slowly decomposed by it, silicic acid being thrown 

 down. If the alcohol used in the preparation be not 

 entirely free of water, a small quantity of an ether, 

 (C 2 H 5 ) 6 Si 2 7 , is formed at the same time. This boils 

 at 230-240. By heating silicic ether with silicium 

 chloride, fluid ethyl-silicic chlorides are formed, as 

 follows: (C 2 H 5 .0) 3 SiCl, boiling point, 155-157; 

 (C 2 IF.O) 2 SiCl 2 , boiling point, 136-138 ; C 2 H 5 .OSiCl 3 , 

 boiling point, 104. When these chlorides are allowed 

 to act upon different alcohols, compound silicic ethers 

 are formed ; for instance, diethyldimethyl silicate, 



(C 2 H 5 O) 2 



>TT 3 *Q\ 2 Si, boiling point, 143-147; triethylmethyl sili- 



/Q2TT5 Q\3 



cate, jj 3 Q ' Si, boiling point, 155-157 ; ethyltri- 

 methyl silicate, /n jpnyj Si, boiling point, 133-135. 



The ethers with organic acids will be treated of in 

 connection with the latter. 



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