The constituents of the essential oil of Californian laurel / by Frederick B. Power and Frederic H. Lees.

  • Frederick Belding Power
Date:
[1904.]
Catalogue details

Licence: In copyright

Credit: The constituents of the essential oil of Californian laurel / by Frederick B. Power and Frederic H. Lees. Source: Wellcome Collection.

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    Fractional Distillation of the Oil. The whole of the oil remaining from the foregoing treatment was mixed with a quantity of ether and dried with calcium chloride. After the removal of the ether, the residual oil was first distilled under the ordinary pressure until the temperature had reached 207°, and then under diminished pressure. In this way, a small amount of dark, non-volatile matter was removed. The whole of the distilled oil was then subjected to a prolonged series of fractional distillations under the ordinary pressure, when a number of fractions were obtained boiling between the following ranges of temperature : 150—165°; 165 —169° ; 169—173°; 173—175°; 175—180°; 180—185°; 185—195°; 195—205°; 205—215°; 215—217°; 217—222°; 222—227°; 227—235°; 235—245°; 245—250°. Identification of Pinene. Fraction 150—165° (sp. gr. = 0-8659 at 16°/16° ; aD-20°in a 100 mm. tube).—This was a colourless, limpid liquid, having a terpene-like odour, and was practically insoluble in 70 per cent, alcohol. 0*1491 gave 0-4672 C02 and 0*1567 H20. C = 85-5; H=ll*7. Ci0Hi6 requires C = 88*2; 11 = 11*8 per cent. This fraction, which evidently consisted chiefly of a hydrocarbon, associated with a small amount of an oxygenated substance which could not be eliminated by fractional distillation, was shown to contain £-pinene by the formation of a crystalline nitroscchloride, from which were prepared the nitrolpiperidine and nitrolbenzylamine, melting respectively at 119—120° and 124—125°. Fraction 165—169° (sp. gr. = 0-8770 at 16°/16°; aD - 18°20' in a 100 mm. tube).—This fraction had an odour recalling that of pinene, but was also somewhat camphoraceous ; it consisted principally of pinene, but contained more of the oxygenated substance than the pre¬ ceding fraction. Fraction 169—173° (sp. gr. = 0*8903 at 16°/16°; aD-13°12' in a 100 mm. tube).—This fraction had a more highly camphoraceous odour than the preceding fraction ; it was specially tested for phellan- drene, but with a negative result. Fraction 173—175°,—This was relatively small in amount.
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