292 PROCEEDINGS OF THE AMERICAN ACADEMY. 



The chlorine derivative was prepared in the same manner as those of 

 the hydrocarbons previously described. On fractioning it in vacuo at 

 35 mm. it collected for the most part at 125°-130°. Its specific gravity 

 was found to be 0.9583 at 20°. A chlorine determination supported the 

 formula of the monochloride. 



0.1560 grm. of the oil gave 0.1179 grm. AgCl. 



Calculated for CnHjiCl. Found. 



18.81 18.69 



The molecular weight was determined at the freezing point of benzol. 

 0.6055 grm. of the oil and 17.37 benzol gave a depression of 0°.890. 



Calculated for CnHjiCl. Found. 



188.5 192 



The index of refraction was found to be 1.476, and the molecular 

 refraction : — 



Calculated for C,iH„iCl. Found. 



55.48 54.32 



The composition of its chloride, together with its molecular weight and 

 molecular refraction, all show that undecane has for its boiling point 

 194°-19G.° 



DODEKANAPHTENE ChLORIDE, C12H03CI. 



The index of refraction of dodekanaphtene was found to be 1.4649, 

 and the molecular refraction : — 



Calculated for C12H24. Found. 



55.38 55.24 



The chlorine derivative was formed, washed, dried, and fractioned in 

 vacuo. It collected for the most part at 130°-135° (17 mm.) Its spe- 

 cific gravity at 20° was 0.9616. A determination of chlorine gave the 

 following result : — 



0.1657 grm. of the oil gave 0.1153 grm. AgCl. 



Calculated for C12H23CI. Found. 



CI 17.52 17.20 



The molecular weight was also determined : — 



