MABERY. — SULPHUR PETROLEUMS. 39 



Series C„H2„. 



Hexaliydro compounds (Reilsteia and Kurbatoff) ; napliteues (Mar- 

 kownikott" aud Ogloblin). 



The lower members of this series include : — 



Hexahydrobenzol, C^Hja, boiling point, 69°. 

 Hexahydrotoluol, C-H14, boiling point, 97°. 



Hexahydrocumol, C9H18, boiling point, 147°-150°. 

 Hexahydrocymol, C10H20, boiling point, 171°-173°. 

 Hexahydroisoxylol, CsIIig, boiling point, 118°. 

 Hexahydromesitylene, CaMis, boiling point, 135°-138°. 



In examining Ohio petroleum for the lower hydrocarbons of this 

 series, the fraction 69°-70°, after the fourteenth distillation, was 

 shaken with concentrated nitric acid, then with concentrated sulphuric 

 acid, and finally heated with metallic sodium. Determinations of car- 

 bon and hydrogen in the purified oil gave results corresponding to the 

 composition of hexane : — 



I. 0.1618 gram of the oil gave 0.4934 gram CO2, and 0.2299 

 gram HjO. 

 II. 0.1891 gram of the oil gave 0.5790 gram CO2, and 0.2663 

 gram HgO. 



Hexahydrobenzol is therefore not present in appreciable quantities 

 in Ohio petroleum.* 



The fraction 96°-97°, bar. 750 mm., after the fourteenth distilla- 

 tion, was purified as before, and the composition determined by 

 analysis : — 



* Recently Markownikoff (Ber. der deutsch. cliem Gesellsch., 1895, p. 577) 

 has ascertained that hexanapliten (hexahydrobenzol) which he formerly re- 

 ported as a constituent of Caucasus naphtha, boiling at 69°-71°, is not a single 

 body. Since the discovery by Baeyer of hexamethylen, boiling point 79°, 

 Markownikoff has discovered that Caucasus naphtha contains rather this same 

 hexamethylen which he has identified by the formation of its nitro products. 

 It will, therefore, be necessary to examine more carefully the corresponding 

 distillates from the oils we have under examination for this body. 



