292 PROCEEDINGS OF THE AMERICAN ACADEMY. 



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

 tin- hydrocarbons previously described. On fractioning it in vacuo at 

 35 nun. it collected for the most part at 125 o -130 o . 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. 



I culated for i',,II„n. Found. 



18.81 18.G9 



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

 O.GOoo grm. of the oil and 17. 37 benzol gave a depression of 0°.890. 



Calculated for C„H 31 C1. Found. 



188.5 L92 



index of refraction was found to be 1.47G, and the molecular 

 refraction : — 



Calculated for <', ,1^,01. 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 -196.° 



DODEKANAPHTENE ClILORIDE, C 12 Ho 3 Cl. 



The index of refraction of dodekanaphtene was found to be 1.4G49, 

 and the molecular refraction: — 



Calculated f"r C, ,11 ,. ind. 



55.38 55.24 



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

 van,,,, it collected for the most part, at 130 L35 (17 mm.) Its spe- 

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

 follow ing result : — 



0.1657 grm. of the oil gave 0.1 L53 grm. AgCl. 



Calculated for <', U M C1. Pound. 



CI L7.52 17.20 



The molecular weight was also determined: — 



