Part IV.] Simonsen : Constituents of Indian Essential Oils. 
11 
at 1277100mm. and 191-1927703mm. It now had the following 
constants ; — d|^. 0'7482, 1‘4:189, [a]^ +1’75°. As the hydrocarbon 
was evidently still not quite pure (Fovmd C = 85‘3, H=14’5 per cent), 
it was shaken with cold concentrated sulphuric acid until it no longer- 
reacted with this reagent. The boiling point of the hydrocarbon was 
unchanged but the constants had altered somewhat and it was no 
OA* OAO 
longer optically active ; Dgg^ 0-7353, Ng- 1-4:140. The analysis of 
the hydrocarbon was attended w ith considerable difficulty as it 
tended to explode in the combustion tube but the figures obtained 
together with the molecular weight determination and the constants 
leave little doubt as to the hydrocarbon being »-undecane. 
0- 1204 gave 0-3712 COg and 0-1651 HgO, 0=841, H=15-2. 
1- 0128 in 10-54 gr. benzene gave a depression of 3 00° M.W.=1.57. 
C11H24 requires C = 84-6, H=15-4 per cent. M.W. = 156. 
Undecane was not acted upon by concentrated sulphuric acid or 
nitric acid in the cold. It did not absorb bromine in chloroform 
solution. When heated with nitric acid (Ul -22) at 180° in a sealed 
tube succinic acid was formed. 
Separation of ferpineol and a sesquiterpene. 
The whole of the fractions boiling above 130°/200mm. and 126°/100 
mm. were combined and heated with alcoholic potassium hydroxide 
solution to hydrolyse any esters present and the oil separated in the 
usual manner. On distillation under diminished pressure two 
main fractions were obtained, the first boiling at 150 — 170°/200mm. 
and the second at 1-50 — 170°/36mm. 
The lower boiling fraction was identified as terpineol by the prepara- 
tion of the nitrosochloride. 
The high boiling fraction was a sesquiterpene which after distill- 
ation over sodium was obtained as a somewhat viscous colourless oil 
with a pleasant pine like odour. It boiled at 145 — 146°/34mm. and 
had the following constants : — 
DgJ-o 0-8954, Nd- 1-486, [a]?°-f-26-25° Mq =65-4. 
0-1465 gave 0-4728 COg and 0-1588 HgO, C = 88-0, H = 12-0 
CJ5H24 requires C=r88-2, H = ll-8 per cent. 
This terpene could not be characterised since it did not yield any 
crystalline derivatives but from a consideration of its molecular refrac- 
tion it was evidently bicyclic. When dissolved in acetic anhydride and 
treated -with a drop of concentrated sulphuric acid a pale pink colour 
was developed which slowly became magenta. 
[ I’l ] 
