Mr. Scliorlemmer on the Hijdrocarbons [May 14 



replaced in tertiary butyl alcohol the group HO by hyarogen, and ob- 

 tained an isomer of diethyl to which he gives the name trimetbylfonnen 

 fCK3 



P J ^ ^ 



1 CH," ^^^y ^'^^^ communication to the Society I described di-iso- 



propyl and amylisopropyl, and pointed out their constitution*. Faither, 

 Erlenraeyer has shown that amyl alcoliol and butyl alcohol formed by fer- 

 mentation Isave the following strLicturef: — 



Butyl alcohol. Amjl alcoliol 



CH3 CK3 CH3 CH3 



^\/ \ / 



CH 



CH.OH CH, 



CH, OH 



These two compounds contain, therefore, the group isopropy], CH(CH,)^, 

 which also m.ust be present in the hydrocarbons derived from these alcohols. 



All hydrocarbons of known structure may be arranged in four groups ; 

 the members of each group, which are liquids at the mean temperature of 

 the air, exhibit a very regular increase in the boiling-point for each increase 

 of CH,. 



1*^. group. Hydrocarbons in which each atom of carbon is united 

 with not more than two other carbon atoms, or in which the carbon atoms 

 are arranged in a single chain. — To this group belong the three lowest 

 members of the series G„ H2„,+2, of which no isomers exist, as well as di- 

 ethyl, C^ H^o, hexylhydride, Cg H^^, derived from suberic acid %, and hep- 

 tylhydride, C-H^^, from azelic acid §. My reasons for considering that 

 the two last ones belong to this group are : (1) They boil at a hio-her tem- 

 perature than their isomers of known structure ; and we find that the 

 simpler the manner in which the carbon atoms are combined, the higher 

 the boiling-point. Thus we have, — 



Di-isopropyl boils at 58° C. Etliylbutyl boils at 62^ C. 

 CK CH, CK CH 



\ / \ / 



CH CH 



CH CH 

 CH CH, 



I 



CH, 

 I 



CH, 



* Proc. 1(03'. Sec. vol. xvi. p. 34. 



t Jourii, Chem. Soc. N. S., vol ii. p. 260. 



t Zeitschrift fur Cheraie, vol. iii. p. 117. 

 § Proc. Roy. Soc. vol.. xiv. p. 4C4. 



