1G. A. RK. PENFOLD. 
and extracted with chloroform. On removal of solvent the: 
pinonic acid distilled at 176 -— 182° O.at 5 mm., and became 
semi-solid on standing overnight at room temperature. The 
crystals were separated and purified from petroleum ether. 
They melted at 68 —-68°5° C. Onrepeated recrystallisation 
specially picked crystals could be obtained of M.Pt. 70° C. 
The semicarbazone of the acid melted at 207° O. 0°2502. 
grams of the acid in 10 c.c. chloroform gave [@]pi7°c,. +90”. 
Other Terpene.—During the fractionations smaller por- 
tions of oil were obtained boiling from 160° O. up to 175° O.,. 
more particularly in the Stradbroke Island sample, the 
quantity in this case being equal to about 50% of the terpene 
fraction. Oareful examination showed the absence of 
nopinene, and it appeared to consist principally of d« pinene 
contaminated with a small amount of other terpene very 
difficult of separation. A comparison of the physical con- 
stants showed that as the boiling point of the respective 
fractions increased, the specific gravity and optical rotation 
decreased, whilst the refractive index went up, thus tending 
to show that the other terpene had a boiling point of about. 
170-176° C., low specific gravity, high refractive index, 
and was inactive. Repeated attempts at identification 
resulted in failure, but in view of the closely allied species. 
containing ocimene, it is quite likely that it may be iden- 
tical therewith. 
Determination of Sesquiterpene.—The highest boiling 
fractions were repeatedly distilled over metallic sodium 
at 10 mm., and although sufficient oil was not available for 
large quantities to be used, the following fairly constant 
fractions were obtained :— 
Woodburn Stradbroke Island 
Sample. Sample. 
Boiling point at 10 mm. 129-—132° C. 129 — 132° O. 
Specific gravity at t2° C. 0°9171 0°9188 
Optical rotation inactive — 2°25° 
Refractive index 20° C. 1°5049 1°5040 
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