— 39 
d-Pinene. In order to confirm our previously reported^) detection 
of d-pinene, we have once more identified this terpene in portions which 
had all the properties of pinene. The constants were: d^go = 0,8587; 
ttj) =-)- 28° 4'. The nitroso chloride formed melted at 102° to 103°, 
its benzylamine derivative at 122° to 123°. 
d-Camphene. This hydrocarbon could be detected, by means of 
the isoborneol-reaction, in all fractions distilling between 160° and 170°, 
representing the bulk of the oil. From this it may be concluded that 
camphene must be reckoned among the principal constituents of the 
oil. A fraction boiling at 161° to 162^ {d^^o =0,8606, = -(- 28^50') 
was fairly rich in camphene. The crude isoborneol formed from the 
isobornyl acetate on saponification, possessed a peculiar, powerful, musty 
odour, which was possibly due to a slight admixture of isofenchyl 
alcohol. This renders it not improbable that cypress oil also contains 
fenchene, which on treatment with glacial acetic acid and sulphuric 
acid (analogous to camphene) yields isofenchyl alcohol. The last-named 
body could not be isolated as such. The isoborneol purified several 
times from petroleum ether, and sublimed, melted at 206° to 207°. 
It is of course well-known that considerable quantities of this compound 
are required in order to bring the melting point by repeated recrystallisation 
from petroleum ether to 212°. In this case we were satisfied with 
the melting point mentioned above. 
Reactions for limonene, dipentene, and phellandrene, made by us 
with the portions of the oil boiling between 170° and 180°, gave 
negative results. 
d-Sylvestrene. This terpene had hitherto only been discovered 
in a few essential oils; it appears to be present in cypress oil in fairly 
large quantities. We detected the hydrocarbon, by means of its dihydro- 
chloride, in fractions which after rectification over sodium had the 
following physical properties: 
Boiling point 172° to 175° 175° to 179° 179° to 181^. 
di50= 0,8592 0,8558 0,8567 
= + 22°2i' -|_20°35' -f20°l6' 
The melting point of the dihydrochloride purified from alcohol lay 
at 72°. The sylvestrene regenerated from this compound by heating 
with sodium acetate and glacial acetic acid, boiled chiefly at 180° to 184^^. 
(Owing to scarceness of material the constants could not be determined). 
The terpene had a pleasant and very characteristic odour. Dissolved 
in acetic acid anhydride, it showed a wonderful blue colouration when 
a drop of concentrated sulphuric acid was added. It was difficult to 
obtain the tetrabromide from the pure sylvestrene, as oily products 
occurred on brominating. But these congealed partly after prolonged 
1) Report October 1894, 71. 
