10 THE ROYAL SOCIETY OF CANADA 



Glycol Stéarate Palmitate. (C2 H4 Cis H35 O2 Cie H31 O2) 

 was prepared by heating the chloride stéarate with silver palmitate 

 and also at another time with potassium palmitate. The former 

 was heated 3-4 hours at 140°C. and the cooled fusion extracted with 

 ether. It was found very difficult to filter the ether solution free 

 of finely divided silver chloride. The method with the potassium 

 palmitate required much longer heating, but the ether solution was 

 readily filtered. The residue from the evaporation of the ether was 

 dissolved in alcohol and crystallized in fractions. Small quantities 

 of distearate and dipalmitate were formed and were separated with 

 difficulty as they are only slightly less soluble than the stéarate palm- 

 itate. 



100 grms. of absolute alcohol dissolves 

 0-011 grms. at 0°C. 

 0-035 grms. at 25° 

 0-049 grms. at 29° 

 0-213 grms. at 39°C. 



The latter is a white crystalline solid, crystallizing like the other 

 members of the series. It melts at 65 °C. and the liquid has a specific 

 gravity of 0-8584 at 70-5°C.and a refractive index of 1-4391 at the 

 melting point. 



It is interesting to note that the melting point and refractive 

 index of the two isomers, glycol dimargarate and the palmitate stéar- 

 ate, are almost identical. 



SUMMARY. 



The mono and diesters of the fat acids can be easily prepared by 

 direct esterification at high temperature and the chloride fat acid 

 esters from glycol chlorhydrin. 



The difference in solubility in warm alcohol permits of easy 

 separation of the two classes of esters. 



