The constituents of the essential oil of Californian laurel / by Frederick B. Power and Frederic H. Lees.
- Frederick Belding Power
- Date:
- [1904]
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: The constituents of the essential oil of Californian laurel / by Frederick B. Power and Frederic H. Lees. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![evolution of gas, and was practically pure. It was recrystallised from ethyl alcohol, when it separated almost completely from the cooled solution in compact rosettes of tine needles, which melted at 217° with evolution of gas. 0-1751 gave 0-3276 OO2 and 0-1260 HgO. 0 = 51-0 ; H = 8-0. 0-1222 „ 0-2288 OO2 „ 0-0885 HgO. C = 5M ^ H = 8-0percent. It is readily soluble in hot water, without decomposition, and on cooling it separates in small, transparent, cubical crystals, which melt at 217° with evolution of gas. 0-1128 gave 0-2120 CO2 and 0-0810 H2O. 0 = 502; H = 8'0. 0-1268 „ 32-2 c.c. moist nitrogen at 22° and 766 mm. N = 29-0. ^12^22^2^6 requires 0 = 51-1 ; H = 7-8 ; N = 29-8 per cent. Semicarbaziidodihydroumbellulonesemicarbazone is soluble in dilute mineral acids, and, on warming the solutions, it is decomposed, rege- nerating umbellulone in quantitative yield. This process has been utilised in order to prepare a pure specimen of the ketone for the determination of its physical constants. A quantity of the semicarbazidosemicarbazone, mixed with about 500 c.c. of water and sufficient sulphuric acid added to effect decomposi- tion, was distilled in steam; the umbellulone contained in the distillate was extracted with ether, the ethereal solution dried with calcium chloride, and the ether removed. The residual liquid was then dis- tilled, when it was found to boil at 219—220° (corr.) under 749 mm. pressure. It is a perfectly colourless liquid, the odour of which is at hist pleasant, somewhat resembling that of mint, but when more strongly inhaled is exceedingly pungent, producing the effects already described. 0-1634 gave 0-4778 CO2 and 0-1370 H2O. C = 79-7 ; H = 9-3. 0-1400 „ 0-4083 002 „ 0-1195 H2O. 0 = 79-5; H = 9-5. requu-es 0 = 80-0 ; H = 9-3 per cent. Sp. gr. = 0-9581 at 15°/15°; [a]D-37°. llydroxylaminodiltydroumbelinloneoxime, OjqHj5(IN*OH)*N11*OH. Umbellulone (15 grams) was added to a solution of hydroxylamine (four molecular proportions), formed by adding a solution of sodium methoxide in methyl alcohol (9-2 grams Na in 300 c.c. methyl alcohol) to a solution of hydroxylamine hydrochloride (28 grams) in the same solvent (300 c.c.). The mixture was then boiled for two hours. After removing the methyl alcohol completely by distillation, the residue, consisting of the pioduct of the reaction mixed with sodium](https://iiif.wellcomecollection.org/image/b22401933_0012.jp2/full/800%2C/0/default.jpg)
