— 55 — 
optical rotation -|-3°28'; saponification number 44,4. After having 
satisfied ourselves that the oil did not contain any highly volatile 
constituents, we fractionated at first with a moderate, later with a 
stronger vacuum. The first portions passed over at 52°, at a pressure 
of 10 to II mm. With these portions a pyrrol-reaction with a chi]) 
of firwood moistened with hydrochloric acid (as observed in some oils 
by E. and H. Erdmann)^) did not occur. We succeeded, however, in 
detecting the following bodies, some of which arc interesting: 
1-Pinene. The first fraction obtained consisted of 10 grams of 
a colourless oil, with a turpentine -like odour, of the boiling poiut 
160 to 167°, specific gravity 0,8592, and rotatory power — 18° 38^ 
When it was endeavoured to obtain the nitrosochloride from the 
fraction which probably contained pinene, an insignificant separation 
of crystals only resulted after introduction of a crystal of nitroso- 
chloride. The pure compound melted at 103°, and yielded, upon 
treatment with benzylamine, pinene nitrolbenzylamine of the melting 
point 122 to 123°. 
1-Camphene. When the fraction (consisting of 10 grams) of 
the boiling point 168 to 170°, and the optical rotation — 12^42', 
was heated to 60° with glacial acetic and sulphuric acids, an oil was 
produced which had the characteristic odour of isobornyl acetate. This ' 
oil was saponified, and purified by driving over with water vapour. 
The oil thus rectified, which had a strong odour of isoborneol, yielded 
on distillation a fraction of the boiling point 210 to 2 1 5 ° , which 
partly congealed in the cold. The transparent, laminated crystals, 
of which the quantity was not sufficient for recrystallisation, melted 
at 195°, and had the unmistakable odour of isoborneol. Although 
we were unable to find the melting point of this body at 212°, we 
are convinced that camphene is a constituent of neroli oil. 
Dipentene. For the detection of this terpene, fractions were 
used of the boiling points 175 to 176° and 179 to 182^. After 
treatment with sodium, repeated 4 to 5 times, the constants of the 
oil boiling at 175 to 179°, were as follows: Specific gravity 0,8581; 
optical rotation — i ° 6 ^ On brominating, a fairly considerable quantity 
of crystals was formed of the melting point 117°. They melted in 
the pure state at 125°, and therefore represented the tetrabromide 
of dipentene. 
Decylic aldehyde. When 160 grams of the portion distilling 
between 70 and 82° at 7 to 8 mm pressure, which showed a fairly 
pronounced aldehyde-reaction with fuchsine and sulphurous acid, were 
continuously shaken for a prolonged time with a saturated solution of 
sodium bisulphite, an exceedingly small quantity (less than i gram) 
^) Berliner Berichte 32 (1899), 1217. 
