— 88 — 
are assumed, whose presence the author considers as proved, a-oxy- 
isopropyl glutaric acid 
C3H7 
CH 
/\ 
/ \ 
CH 
/\ 
HoC^ ^CH(OH) 
HoC 
2 ^ \ 
COOH 
to "pseudo" phellandrene 
COOH 
HoC 
CH 
/\ 
/ \ 
CH(OH) corresponds 
to ''normal" phellandreme 
COOH COOH 
and a-oxy-isopropyl adipic acid 
C3H7 
CH 
CH 
/ 
/ 
C.CH 
C3 H^ 
H^C 
I 
CH 
c 
CH 
CH 
CH, 
In agreement with this view of the constitution of phellandrene is 
the reduction with sodium and amyl alcohol. Here there is formed 
the hydrocarbon 
C3H7 
CH 
H^C 
CH. 
HoC 
\ 
CH 
c.ca 
which must be formed from both the normal and the pseudo phel- 
landrene, as both contain the two double linkings in close proximity, 
i. e. a conjugated system. 
The behaviour of phellandrene dibromide also agrees with the 
accepted formula. If, namely, it is poured into alcoholic potash, there 
are obtained, on the one hand cymol, on the other a body containing 
