_ 63 - 
We are in a position to confirm von Soden and Zeitschel's statement 
that here also, after removing the terpineol and linalol by means of 
phthalic anhydride, a mixture of alcohols remains, which unites only 
partially with calcium chloride. The product which we purified by 
treating it twice with calcium chloride, showed a boiling point a little 
lower than geraniol. 
The principal fraction boiled under atmospheric pressure at 225^ 
to 227°, or from 106° to 107,5° at 7 ^ mm] the following fraction 
from 227° to 228° at atmospheric pressure, or from 107,5^ to 109'' 
at 7 to 8 mm. 
The odour of these fractions very much resembles that of geraniol, 
but differs from that of citronellol. The diphenyl urethane was produced 
with 4 g of the principal fraction. We readily obtained a solid product 
which after being recrystallised once from dilute alcohol, melted indistinctly 
at from 60° to 64°. The melting point could not be raised in any 
marked degree (65° to 66°), in spite of repeated recrystallisation from 
alcohol. Only by partly dissolving the preparation in cold petroleum 
ether, and allowing the solvent to evaporate, we were able to obtain 
crystals which showed the melting point 73° to 75°, indicated by 
Hesse and Zeitschel for neryl diphenyl urethane. The melting 
point of this product was, however, after further recrystallisation from 
petroleum ether, raised to 80° to 81°, i. e. the melting point of geranyl 
diphenyl urethane. 
It remains, therefore, open to doubt, whether the melting point 
given by Hesse and Zeitschel for neryl diphenyl urethane, is 
correct. 
We will now compare the physical constants of the 'nerol' produced 
by us (which essentially agree with the figures given by v. Soden 
and Zeitschel), with the constants of the pure geraniol regenerated 
from the solid calcium chloride compound: 
It will be seen that the differences are so small, that on the ground 
of a determination of the constants, a differentiation of the compounds 
is not possible. For this reason it requires several further examinations 
to establish whether nerol, according to its principal quantity, represents 
a new alcohol differing from geraniol. 
As the nerol produced according to Hesse, v. Soden and Zeitschel 
is still strongly contaminated with geraniol, we have attempted by another 
method to purify it further from geraniol. 
Nerol 
Geraniol 
Boiling point 225° to 227 
o 
d = 0,8804 
ai, = + o°i7' 
nD17°= 147665 
