— 94 — 
The author calls this body ''dihydro-isocaryophyllene", in view of 
the fact that caryophyllene has yielded no reduction product, and that 
the formation of the reduction product C^^ Hgg takes place from caryo- 
phyllene hydrate, whose constitution is not analogous to that of caryo- 
phyllene. It would therefore be more correct to designate caryophyllene 
hydrate as iso-caryophyllene hydrate. 
For the rest, dihydro-isocaryophyllene is also obtained when iso- 
caryophyllene hydrate is treated with phosphorus pentachloride, and 
the product C^5H25C1 thus formed (which has the melting point 65° 
and the boiling point 295°) is reduced with sodium and alcohol whilst 
cooled in ice. 
From experiments which will be published later on, Semmler 
concludes that the constitution of the sesquiterpene C^g can be 
reduced essentially to the following type: 
CH3CH2 C< 
CH CH 
CH CH. 
CH. 
CH 
CH 
CH, 
C.CH, 
This would be a derivative of a hydrated naphthalene, whose 
formation, in view of the relations existing between the terpenes (and 
consequently the sesquiterpenes) and isoprene, might be explained as 
follows : 
C 
I 
CH 
C Hg C Hg 
\^ 
CH3 CH, 
\^ 
C H3 C Hg C • C H 
c 
1 
C 
1 
C CH CH, 
CH 
CH 
1 II 
CH CHj 
CH, CHj 
II 
— > C H„ C H„ ; 
1 1 
C Hg C Hg 
II 
CH^ CH 
\/ 
CH CH. 
\/ 
CH, CH 
C 
\ 
C 
c 
\ 
CH3 
\ 
CH3 
CH3 
3 ^-^^2 y ^^^3 
CH CH CH, 
I I 
CH CH, 
> CH2 CH 
CH CH. 
CH„ 
I isoprene 2 isoprene 
limonene 
3 isoprene 
sesquiterpene 
