Chemistry of Essential Oils

486 THE CHBMISTEY OF ESSENTIAL OILS

The leaf oil contains a terpene not yet characterised. Cadinene is

present, and possibly a second sesquiterpene not hitherto isolated, which

Pavesi has named amorphene.

Shinosaki and Hoshinol have more recently examined the oil obtained

by distillation of the fruits, from which they obtained a yield of 1*1 per

cent. The oil had a pepper-like odour ; its characters were as follows :—

Specific gravity

Optical rotation

Refractive index

Acid value.

Saponification value after acetylation

0-9125

±0°

1-5032

0

40-5

The higher boiling fractions contain a sesquiterpene alcohol melting

at 118°.

The oil, distilled, apparently, from the fruits only, has recently been

examined by Shinosaki and Hoshino,^2 who obtained a yield of 1*1 per

cent. The oil, which has an odour of pepper, has the following

characters:—

Specific gravity 0

*

9125

Optical rotation ±0°

Refractive index 1-5082

Acid value ........... 0

Saponification value after acetylation 40*51

Cadinene and another sesquiterpene were detected, and a sesquiter-

pene alcohol melting at 118°.

OLL OF EOBINIA PSEUDACACIA.

The flowers of this tree yield an essential oil by extraction with a

volatile solvent. The oil has a specific gravity 1

*

050, and is fluorescent-

in alcoholic solution. It contains methyl anthranilate, indol, heliotropine,

benzyl alcohol, linalol, terpineol, and traces of nitrogenous bodies of the

pyridine series.

OIL OF DANIBLLA THUBIFEKA.

Lenz
3
has obtained from the oleo-resin of Daniella thurifera 23 per
cent, of essential oil, having a specific gravity 09845 at 20° and optical
rotation + 6°. Cadinene was detected in the oil. An oil distilled by
Schimmel & Co. had the following characters :—
Specific gravity 0-9216
Optical rotation......... — 5° 43'
Refractive index 15067
Acid value 0
Ester „ 1-9

GERANIACEjE.

OIL OF GEBANIUM.

True geranium oil is distilled from the fresh herb of several species of
pelargonium, chiefly Pelargonium odoratissimum, Pelargonium capitatumr
Pelargonium graveolens, and Pelargonium Radula, and its variety, roseum*

1

J. Ch*m. Ind. Tokyo, 21 (1918), 774.

*

3 Jour. Soc. Chem. Ind.t 1919, 38, 27.

Berichte, 47 (1914), 1989.