MABERY. — CONSTITUENTS OP PETROLEUM. 129 



The specific gravity of this chlordecane at 20° was 0.8914. To the 

 same product, separated by Pelouze and Cahours, no speciHc gravity was 

 given. The ehlordecanaphteue prepared by MarkownikofF and Oglobiue,* 

 from decanaphtene boiling at 1 GO^-Kj-i", gave as its specific gravity 

 0/j;jOO at 0°. It boiled at 205°-200° (Cor.). Chlordecane obtained by 

 Pelouze and Cahours boiled under atmospheric pressure at 200°-204°. 

 Our chlordecane could not be distilled under atmospheric pressure with- 

 out decomposition. As nearly as its boiling point could be determined, 

 it distilled at 197°-203°. 



On account of the small quantity of the chlorine derivatives described in 

 this paper, the specific gravity determinations may not be strictly accurate. 

 But the errors are doubtless small, and they do not affect the value of the 

 determinations in establishing the identity of these derivatives. 



In continuing the distillation of the higher chlorinated products from 

 163°-164° decane. Pennsylvania petroleum, approximately 15 c.c. of an 

 oil collected after the eighth distillation at 160°-170° that was heavier 

 than water. Even these high distillates, which could not be heated to 

 their boiling points without decomposition, could be distilled in vacuo 

 with little if any decomposition. This product gave on analysis the values 

 required for dichlordecane : — 



I. 0.2293 gram of the oil gave 0.4829 gram CO2, and 0.1884 gram 

 HoO. 

 II. 0.2557 gram of the oil gave 0.3420 gram AgCl. 



Found. 



II. 



33.09 



This dichlordecane gave 1.0187 as its specific gravity at 20°. 



Decane, CioH„o, 173°-174°. 



Above 163° (730° mm.) the distillates were small in amounts to 168°, 

 where they began to increase, and large quantities collected within de- 

 gree limits to 173°, when they again fell off to small volumes. The 

 fraction 169°-170° was selected for examination, which included analysis 

 of the crude distillate, analyses after purification with acids, and the 



* Ann. Chim. Phys., (6.), II. 453. 



VOL. XXXII. 9. 



