ESSENTIAL OIL OF KUNZEA CORIFOLIA. 203 
to consist principally of d-c-pinene which gave the follow- 
ing constants :—27/1/21, boiling point 155 — 157° C., specific 
gravity +2° O. 0°8613, optical rotation +40°6°, and refractive 
index 20° O. 1°4655. 10/10/21 boiling point 155—157° C., 
specific gravity +3° O. 0°8623, optical rotation + 39°9", 
refractive index, 20° O. 1°4651. | 
Confirmatory evidence of its identity was established by 
preparation of the following derivatives :— 
On account of the high optical rotation the terpene failed 
to give a nitrosochloride; on mixing, however, with an 
equal volume of levo-pinene [a], —50°18°, which by itself 
failed to give a nitrosochloride, an excellent yield of the 
derivative was obtained which, when purified, melted at 
104° C. 
The hydrochloride, prepared by saturating 5 c.c. of the 
terpene at — 20°C. with dry hydrochloric acid gas, resembled 
| camphor, and after recrystallisation from alcohol, melted 
aT) 7 Sie 
Oxidation of the Terpene.—58 c.c. were shaken with 120 
grams of potassium permanganate, 1000 c.c. water, and 
200 grams ice until completion of reaction. The liquid was 
passed through a suction filter whereby the manganese 
sludge was removed, and the clear liquid then evaporated to 
small bulk. It was then steam distilled in order to remove 
unchanged terpene, and again concentrated by evaporation. 
Dilute sulphuric acid was then added, the liberated pinonic 
acid extracted with chloroform, which latter solvent was 
distilled off, and the crude acid distilled at 5 mm. pressure, 
when the greater portion came over at 180—181° C. After 
Standing for some considerable period crystals separated, 
and these were removed by filtration. On recrystallisa- 
tion from petroleum ether the crystals melted at 68° C. 
0°1704 giam of the pure acid dissolved in 10 c.c. chloroform 
rotated the plane of polarised light +1°7°. Specific rotation 
