Part IV,] Semonsen : Constituents of Indian Essential Oils. 5 
From a consideration of the physical constants it was clear that frac- 
tious I-IIl consisted of d-a-pinene and the presence of this hydro- 
carbon was confirmed by the preparation of the nitrosochloride melting 
at 105 — 106° and the nitrolpiperide melting at 118 — 119°. Fractions 
IV-VIII were foimd to consist essentially of a mixture of d-a-pinene 
and d-^-pinene. The former hydrocarbon was identified by means of 
its nitrosochloride, whilst the latter was converted into nopinic acid 
by oxidation with potassium permanganate in the usual manner. 
The nopinic acid obtained melted at 125 — 127.° 
The nature of the hydrocarbons present in fractions IX-XI could 
not be determined, ^-pinene was present in all these fractions but none 
of the commoner monocyclic terpenes could be detected. Fraction XII 
consisted essentially of impure sesquiterpene no alcohols being 
present. 
The sesquiterpene fraction XIII on redistillation was foxmd to boil 
very constantly at 151°/37mm. and at 252 — 254°/706mm. After- 
repeated distillation over sodium it had the following constants : — 
DgJ-! 0-9236, 1-497, [a] ^’+36-69.° 
0-0777 gave 0-2522-C02 and 0-0828 H2O, C=88-5, H=1T8. 
C15H24 requires C=88-2, H=ll-8 per cent. 
The sesquiterpene d-longifolene (Journ. Chem. Soc. Trans. 1920. 
117. 578.) had constants agreeing fairly closely with these and the 
identity of the two hydrocarbons was established by the preparation of 
the hydrochloride, hydrobromide and the hydroiodide of the terpene 
from P. Khasya. These melted respectively at 59-60°, 69-70°, and 71°. 
No alteration in the melting points was observed on admixture with 
specimens of these derivatives prepared from the hydrocarbon from 
P. longifolia. 
[ 116 J 
