1868.] of the Series G,,ll2n+2- 369 



Now hexylhydride boils at 69°-5 C, and the only structure more simple 

 than ethjlbutyi is the following, which must express that of hexylhydride, 



CH3 



CII, 

 I 



I 



OH, • 



CH, 

 I 



The same is the case iu the hydrocarbons having the composition 



CavbdimethyldielliyL Etliylamyl. ITeptylhydnde. 



Boiling-point SG"". Boiling-point 91". Boiiing-point 100°-5. 



CH, CH3 CH3 CH3 



t \ / I 



CH, v/j OH, 



CH, 



(2) The formation of these hydrocarbons points out that they must 

 have a very simple constitution. The acids from which they are derived 

 are obtained by the sphtting up of compounds containing a large number 

 of carbon atoms, and from these acids they (hydrocarbons) are derived by 

 a further separation of carbon The difference in the boiling-points of 

 liexylhydride and heptylhydride is 31° C. 



Boiling-point. 



C^H^, 69-5 



aS^, 100-5 



The hydrocarbon C^H^^, found in American petroleum appears to be 

 identical with that prepared from suberic acid. The higher specific gra- 

 vity which the hexylhydride from rock-oil shows, as observed by Cahours 

 and Pelouze and by me, is occasioned by impurities. As I have shortly 

 mentioned in my last communication, I have studied the action of nitric 

 acid upon this hydrocarbon. On oxidizing in this way about 120 grms., 

 of which the boiling-point was 67° to 69° and the specific gravity 0*0709, 

 at 15°, about 10 grms. were left unattached, which certainly must have 

 been very pure. This remaining portion boiled at 70°, and had the spe- 

 cific gravity 0-6C51 at lG°-5. The hexylhydride which Erlenmeyer and 



