[ruttan-roebuck] esters OF ETHYLENE GLYCOL 5 



100 grms. of absolute alcohol dissolves 

 0-010 grms. at 0° C. 

 0-028 grms. at 25° C. 

 0-037 grms. at 28° C. 

 0-112 grms. at 40°C. 



Combustion by the oxygen method gave the following results: 



C. H. 



Theory 76-64% 12-55% 



Determined 1 76-14% 12-45% 



II 76-27% 12-67%o 



There is such a small variation in the relative proportions of 

 carbon, hydrogen and oxygen in both the fatty acids and these com- 

 pounds, that the experimental error in a combustion made it of little 

 value as test of purity. These esters were consequently identified 

 by determining the content of fatty acids by a modification of a method 

 devised by Chittenden and Smith in their work on the palmitins.^ 



A weighed quantity of the ester was dissolved in alcohol saponi- 

 fied by boiling with an excess of 3 N. alcoholic potassium hydroxide 

 and evaporated to dryness. The resulting soap dissolved in about 

 200 c.c. of hot water in a beaker, the acid set free by hydrochloric 

 acid, the beaker kept in hot water and on cooling and after standing 

 over night, the solid fat acid can be easily removed quantitatively, 

 washed until free from chlorine ions, dissolved in ether, evaporated, 

 and the dried fat acids weighed. 



Analysis of the distearate gave: 



Theory I. II. 



Stearic acid 95-62 94-99 95-33 



Glycol Monostearate, C2H4OHC18H35O2 is a pure white solid 

 with similar crystalline habit to the distearate, it melts sharply at 

 58-5°C. and the liquid has a refractive index of 1-4310 at the melting 

 point. The fused ester has a specific gravity of 0-8780 at 60°C. 

 It is very much more soluble in ether, in alcohol, and in hydrous 

 alcohol than the distearate. 



' Am. Chem. Jour. 6, 217. 



