120 



Prof. M. Simpson. Chemical Notes. 



[Feb. 21, 



On submitting the product to distillation, I found that the greater 

 part passed over between 180° to 187° Cent. 



This proved on analysis to be pure brom-dichlor allyl. 



On the action of Chloride of Acetyle upon Valer- aldehyde. 



Many years ago I ascertained that acet- aldehyde enters into direct 

 combination with chloride of acetyle, the compound C 4 H 7 2 C1 being 

 formed.* I now find that valer-aldehyde also combines directly 

 with this body. Their union is determined in the following manner : — 

 One molecule of valer- aldehyde is mixed with one of chloride of acetyle 

 (the evolution of heat was observed when they came into contact), and 

 the mixture is subjected in a sealed tube to the temperature of 100° 

 Cent, for about three hours. At the expiration of this time the tube is 

 opened, and its contents subjected to distillation. It commenced to 

 distil at 115° Cent., and between that temperature and 145° a little 

 more than half of the fluid passed over. The remainder refused to 

 distil, although heated to 300°. (A considerable quantity of hydro- 

 chloric acid gas was evolved during the distillation, and also when the 

 sealed tube was opened.) On re-distilling I found that the greater part 

 of the distillate passed over between 118 and 128° Cent. This gave 

 on analysis the following numbers, which agree pretty well with the 

 formula C 5 H 10 O.C 3 H 3 OC1:— 



Theory. Experiment. 

 Carbon .. .. .. 5l'06 50-30 



Hydrogen .. 7'90 8'15 



This compound is a little lighter than water, its specific gravity 

 being 0*987 at 17° Cent. It is gradually decomposed when brought 

 into contact with water, hydrochloric acid, acetic acid, and valer- 

 aldehyde being formed. 



The compound, which would not distil, was neutral to test-paper. I 

 have not yet succeeded in rendering it sufficiently pure for analysis. 



I think we may now safely conclude that all the aldehydes of the 

 fatty series combine directly with chloride of acetyle, and that this 

 reaction is characteristic of this class of compounds. 



On a new Double Salt of Iodide of Calcium and Iodide of Silver. 



This salt is prepared by heating a concentrated solution of iodide of 

 calcium and adding to it moist iodide of silver till it ceases to be dis- 

 solved. The filtered solution crystallizes out on cooling in long white 

 brilliant needles. These were pressed between folds of filtering paper, 

 dried at 100° Cent., and analysed. The following are the results of 

 two analyses : — 



CaI 2 2(AgI)6(H 2 0). 



* Comptes Hendus seance du 29 Novembre, 1858. 



