244 Proceedings of the Royal Irish Academy. 



Action of Acetic Anhydeide and Sodium Acetate on 

 Dimethyl-Pentadecyl Cakbinol. 



0'5 gramme of dimethyl-pentadecyl carbiuol, 0'5 gramme of anhydrous 

 sodium acetate, and 2 c.c. of acetic anhydride were taken in a flask with a 

 reflux condenser, and heated in a sand-bath for one-and-a-half hours. Excess 

 of water was added, and the mixture was extracted with ether. The ether 

 sohTtion was washed, first with sodium carbonate, next with water, and was then 

 evaporated. To remove acetic anhydride it was necessary to warm the product 

 gently with water, and again extract with ether. In this manner we obtained 

 {)'416 gramme of an oily liquid which did not smell of acetic anhydride, and 

 which on cooling in iced water crystallized in small stars. 



U-416 gramme of the substance required for hydrolysis 2-057 c.c. of 



N 



— alcoholic potash, corresponding to ester number 137'9. 



The ester number of CHsCOOCnHja is 179. 



When the ester number had been determined, the contents of the flask 

 were evaporated to dryness and extracted with petroleum ether ; and the 

 Hiibl-Waller iodine number of the extract was determined. 0-1484 gramme 

 of extract absorbed 0-01257 gramme of iodine. The iodine number was 

 therefore 10-16. 



The iocUne number of CieHsG is 100. 



Action of Acetic Anhydride and Sodium Acetate on Diethyl 

 Heptadkcyl Cakbinol. 



1 gramme of the alcohol was treated with 1 gramme of sodium acetate and 



4 c.c. of acetic anhydride in a manner similar to that described for pentadecyl- 



dimethyl carbinol. A solid product was obtained which required 0-7 c.c. of 



N 



— alcoholie potash, corresponding to an ester number of 22. 



The ester number of CH3CO . OG.-.'H.,, is 1 5217. 

 The iodine absorption was also determined as previously described. 

 0-5051 gramme of substance absorbed 0-02627 gramme of iodine, corre- 

 sponding to an iodine number, 5-2. 

 The iodine number of C2.,H44 is 81-9. 



Action of Potash-Lime on Dimethyl-Heptadecyl Carbinol. 



I. 0'7665 gramme of the alcohol was melted on the water-bath, and an 

 equal weight of powdered potash was stirred into the liquid. The solid mass 



