CHAMAECYPARIS OIL
Chamaecyparis obtusa, the hinoki tree which is extensively grown in
Japan, furnishes a valuable timber wood, and the tree thrives well in the
mountainous districts of Formosa. Uchida2 has examined a sample of
the crude oil obtained by the dry distillation of the wood in Formosa.
It is a reddish-brown mobile liquid
possessing a woody and empyreumatic smell and containing tarry matter. The
yield was 2,4 per cent, of the wood. The rectified oil obtained by distillation
with steam was lemon yellow in colour, and after treatment with sodium
carbonate solution to remove pyroligneous acids it had a specific gravity of 0,8821,
refractive index, 1,4990, and specific rotation + 50,37° in chlordform solution.
The constituents identified were D-α-pinene and cadinene, with a small amount
of oxygenated compounds, the amount of terpenes being about 70 per cent., and
that of the sesquiterpenes about 24 per cent.
The leaves of Chamaecyparis lawsoniana yield
about 1 per cent, of oil having the following characters :
Specific gravity 0-9308
Optical rotation + 23° 48'
Refractive index 1,4884
Acid value 3,7
Ester 61,6
(after acetylation) 78,8
The oil contains laurinic aldehyde.
The oil distilled from the wood of Chamaecyparis
lawsoniana and rectified by steam has been examined by Schorger.1 The oil
has the ollowing characters:
Specific gravity 0,8905
Refractive i n d e x 1,4758
at 15°
Optical rotation + 39,6°
Acid value 0-3
Ester 32,8
(after a c e t y l a t i o n ): 71,6
The oil behaved as follows on fractional
distillation :
(760 mm) 155° to 157°................60.5 per
cent
“ 157° to 170°................3.5
per cent
“ 170o to180o..................4.0
per cent
(15 mm)
100° to 130°................20.5 per cent
“ 130o to160o..................7.0
per cent
“ 160o to190o..................1.0
per cent
The oil contains D-α-pinene to the extent of
60 per cent., dipentene (6 to7 per cent.), L-borneol (11 per cent.), cadinene
(6 to 7 per cent.), formic and acetic acids in the free state, and formic and
capric acids as esters.
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1Jour.
Amer. Chem. Soc., 33, 755. 2Jour.
Amer. Chem. Soc. (1916),
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