Chemistry of Essential Oils

520 THE CHEMISTRY OF ESSENTIAL OILS

Density at 15° C Rotatory Power ....... Solubility in 95 per Cent. Alcohol Acid Number Ester „ „ Contents expressed as C 10 H 17 COOCH 3 Coefficient of Saponification of the Acetylated Oil Total Alcohols expressed as C 10 H 18 O.

I.

0-9594

- 53° 56'

1 volume, 1-3 129-7 45-4 °/ 0 167-0 52-5 °/ 0

ir.

0-9651

- 45° 16'

bhen cloudy 1-4 131-6 46-0 °/0 180-8 57-5 °/0

Ylang-ylang oil from the Seychelles has been examined by the chemists at the Imperial Institute. Sample No. 1 was examined in 1913; No. 2 was examined in 1910, and No. 3 is the same as No. 2, but kept for three years and then re-examined.

15° C

15 C.

Optical Rotation ttD Acid Value .... Ester , Saponification value. „ „ after Acetylation Solubility in 90 per Cent. Alcohol ...

1.

0-9567

/ - 28° 5'

\at 20° C. 3-3 126-0 129-3

181

Gives a clear solution with less than 0-8 vol.; with 0*8 vol. or more becomes turbid

2.

0-9200

- 30°

at 21° C. 4-2 42-2 46-4

—

Soluble in 1 vol.; beco n- ing turbid with a larger quantity

3.

0-9250

- 28° 36'

at 24° C. 2-6 53-5 56-1

—

Soluble in $ vol.; becom- ing turbid with 1 or more vols.

A Madagascar ylang-ylang oil has been examined by Schimmel & Co. 1 and found to have the following characters:— Specific gravity 0-9577 Optical rotation - 49° 55' Refractive index 1-51254 Acid number .......... 1-8 Ester „ .... 113-2 „ „ (after acetylation).....160-2

On fractionation it gave the following fractions:—

45 to 70° 70 „ 100° 100 „ 110° 110 „ 125° Residue

Per Cent.

10-7

18-0

27-0

12-5

31-8

0-9848

0-9572

0-9000

0-8932

1-0725

- 5° 20'

- 49° 16'

- 93° 6'

- 72° 40'

- 3° 45'

Saponifica- tion No.

207-2

166-5

37-3

28-0

181-0

1 Report, November, 1908, 135.