Nek g., Centrophorus granulosus and Scymnus lichia. ‘Ougtaty Ce es, 
formula CsoHs0. for _ OE on later on, the formula Cartas. 
eer es added two atoms of bromine. Its properties pean well withe the cons 
quoted in literature’) for cyclolinaloolene or cyclodihydromyrcene. =i —i(Csé~CS 
The former hydrocarbon had been prepared formerly by Semiiien ao treating 
linaloolene, a reduction-product of linalool, with concentrated sulphuric acid. — Cyclo- 
dihydromyrcene was obtained’ by the same author by inversion of dihydromyrcene a ani f 
described as an isomeride of cyclolinaloolene. 
The result. of Chapman’s investigation is of high interest from the phystotogel 
point of view, since it reveals the connection.of a hydrocarbon of animal origin with 
the Pierce which hitherto are known to be of exclusively vegetable origin, ta 
Alcohols. eee oe. a. 
On the preparation of heptyl alcohol from cenanthol, see p. 71 of this Boas a Fi 
In order to identify the terpene alcohols or phenols occurring frequently: in essential 
oils, the phenylurethanes are often resorted to, for which purpose the alcohols or 
phenols are usually treated with the calculated amount of phenyl isocyanate at room 
temperature or with slight heating, sometimes with addition of aluminium chloride. — 
F. Weehuizen*) recommends a different process, consisting in heating the ingredients _ 
in a solution of a petroleum fraction of the b. p. 170 to 200°. The advantages offered 
by this solvent (consisting principally of decane and undecane) are said to be the 
following: — 1. Since there is no water present, formation of diphenylurea is impossible.— . 
2. The terpene alcohols and the phenols as well as phenylisocyanate are soluble in the 
petroleum fraction.— 3. The urethanes formed are difficultly soluble in the fraction 
and are precipitated therefrom, on cooling, in well-formed crystals. ° ‘ it 
Weehuizen dissolves 1 g. of the terpene alcohol or phenol in about 6 to 10 com. 
of the petroleum fraction, adds the necessary quantity of phenylisocyanate and boils” 
the mixture for 30 to 60 minutes; sometimes, longer boiling is necessary. Some of 
the phenylurethanes are difficultly soluble even in the boiling solvent; in such cases, 
10 to 20 per cent. of the volume of absolute alcohol are added. On cooling, the 
urethanes are separated off; for recrystallisation, Weehuizen uses the same petroleum _ 
fraction. With eugenol, it is advisable to carry out the reaction in solution with ben-— 
zine of the b. p. 70 to 80° in the cold and to let the mixture stand for a couple of 
days in a closed vessel; the crystals of eugenol phenylurethane then are separated off. 
By means of phenylisocyanate, borneol and camphor may be separated, both bodies 
being soluble in the petroleum fraction; on boiling, bornylphenylurethane is formed © 
which crystallises out in the cold, werene camphor does not react, and rem 
dissolved if sufficient of the solvent is present. With linalool and. geraniol, no | 
results were obtajned; especially in the case - linalool, much t diphenyl was 
a en a and be auitbenvene in tier solution, as Weehuizen remarks. 
this Report. carshed 
