56 Messrs. Perkin and Duppa on lodacetic Acid. 



The formula C (H^ I) 0^ requires— 



Carbon 12-84 



Hydrogen . . . 1"60 



Iodine 68-42 



We have been able to produce but few of the iodacetates, or 

 to study the metamorphoses of the acid, as it is so difficult to 

 obtain in quantity. 



lodacetate of Ammonium is a very soluble crystalline salt, not 

 deliquescent. 



lodacetate of Potassium, is a soluble crystalline permanent salt. 



lodacetate of Barium is a crystaUine salt, tolerably soluble in 



water, and precipitated from its solution by alcohol. Analysis 



gave the following results, which we place in juxtaposition with 



the theoretical numbers : — 



Theory. Experiment. 



I — 

 Carbon (4 equivs.) 

 Hydrogen (2 equivs. 



Iodine 126 



Barium 68-59 



Oxygen (4 equivs.) 



We should have repeated this analysis had we possessed suffi- 

 cient substance ; but the numbers agree closely enough when 

 those obtained from the acid are taken into consideration. 



lodacetate of Lead crystallizes in prisms, is difficult to obtain 

 pure, as it readily splits up into glycolic acid and iodide of lead : 

 this is most readily effected by boiling. 



When we attempted to decompose the aqueous solution of this 

 salt by sulphuretted hydrogen, we found that the liquid con- 

 tained hydriodic acid and glycolic acid?, the iodacetic acid 

 having been completely decomposed. 



lodacetate of Ethyle is an oily liquid heavier than water, of a 

 very irritating nature, if anything worse than the corresponding 

 bromacetic compound. We did not make an analysis of this, as 

 it was quite impossible to obtain it sufficiently pure. It soon 

 becomes brown from spontaneously giving oflF iodine. 



lodacetate of Amyle is an oily liquid heavier than water. It 

 has the odour of pears, similar to the bromacetate of amyle, and 

 also when heated irritates the eyes and nose. 



We hope in the course of a very short time to publish our in- 

 vestigations on diiodacetic acid, which we have lately obtained. 



