82 Frankland and Duppa On the Acids [Feb. 16, 



not distil below 100 C., at about which temperature a violent action sets 

 in ; a great quantity of gas is evolved, and the residue solidifies to a pitch- 

 like mass, which, on treatment with water and subsequent distillation, yields 

 about one-fourth of the leucic ether employed. If the above-mentioned 

 white mass, instead of being heated, be mixed with water, it effervesces 

 strongly, zinc hydrate is formed, and pure leucic ether separates in quan- 

 tity nearly equal to that originally employed. 



In a quantitative experiment 12'93 grms. of zincethyl were treated with 

 leucic ether, ex cess being avoided; 15'6 7 grms. of leucic ether were required 

 to saturate the above quantity of zincethyl, and the weight of hydride of 

 ethyl evolved, which was carefully determined, amounted to 3'08 grms. 

 These numbers closely agree with those deduced from the following equa- 

 tion : 



"(C 2 H 5 ) 2 

 Cj jJ-__ +Zn ,, { C : H :=c/ 



OC 2 H 5 [ OC 2 H. 



Ethylic leucate. Zincmonethyl-ethylic 



leucate. 

 as seen from the following comparison : 



Theoretical. Experimental. 



Weight of hydride of ethyl evolved .. 3'04 3-08 



Zincmonethyl-ethylic leucate is a colourless viscous solid, soluble in ether, 

 but apparently incapable of crystallization. It absorbs oxygen with avidity 

 and in contact with water effervesces strongly, reproducing leucic ether 

 according to the following equation : 



2 H 6 ) 2 r(c 2 H 5 ) 2 



ZnC 2 H OH C 2 H,j fOH 



+ 2*i 2 U_U +Zn 



2 H 5 OC 2 H 5 



Zincomethyl-ethylic Ethylic leucate. 



leucate. 



Zincmonethyl-ethylic leucate combines energetically with iodine ; an 

 ethereal solution of the latter added, to it is almost instantaneously decolo- 

 rized and a large quantity of iodide of ethyl is produced. In continuation of 

 the above quantitative experiment the following results were obtained. The 

 product of the action of 12'93 grms. of zincethyl upon 15*67 grms. of 

 leucic ether decolorized an ethereal solution containing 23*75 grms. of 

 iodine, the quantity required by the following equation being 25'04 grms., 



5 ' 4 



4 _ c +Z.L+JC.H.I. 



Zincmonethyl-ethylic Zincoleucic ether. 



leucate. 



