114 PROCEEDINGS OF THE AMERICAN ACADEMY. 



the same boiling point separated from coal tar, Schorlemmer found 

 the specific gravity 0.7190 at 17°.5. In our product purified with 

 fuming sulphuric acid, the required percentages of carbon and hydrogen 

 were obtained. 



0.1475 gram of the oil gave 0.4562 gram COg, and 0.2073 gram HgO. 



In the formation of chlorine derivatives from this octane, the same 

 method was employed without cooling as in the case of ihe more 

 volatile distillates. It was ascertained tliat the best yield of mono- 

 chloroctane was given when the quantity of chlorine absorbed was 50 

 per cent in excess of the amount theoretically required to form the 

 monochlor derivative. Even with this excess, still a small amount of 

 the hydrocarbon remained unchanged. Since it was found that the 

 chlorinated compound could not be distilled under atmospheric pres- 

 sure without serious decomposition, after washing and drying it was 

 fractioned in vacuo under a tension of 50 mm., within limits of 10°, 

 5°, 2°, and finally for some time within 1°. Under 50 mm. fractions 

 collected at all points between 65° and 150°, but a larger quantity at 

 83°-84°, which under atmospheric pressure distilled at 164°-J66°. 

 The composition of this substance was determined by analysis : — 



I. 0.1 479 gram of the oil gave 0.3523 gram COj, and 0.1537 gram HoO. 

 II. 0.1961 gram of the oil gave 0.1888 gram AgCl. 

 III. 0.2483 gram of the oil gave 0.2408 gram AgCl. 



III. 



23.97 



A determination of vapor density gave a value required for mono- 

 chloroctane : — 



0.1682 gram of the oil gave 78 c.c. of vapor at 182°, and under a 

 tension of 400 mm. 



Required for CgHijCl. Found. 



5.14 5.28 



