Chemical examination of Ornithogalum thyrsoides / by Frederick B. Power and Harold Rogerson.

  • Frederick Belding Power
Date:
[1910?]
Catalogue details

Licence: In copyright

Credit: Chemical examination of Ornithogalum thyrsoides / by Frederick B. Power and Harold Rogerson. Source: Wellcome Collection.

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    dried, when it amounted to 2'7 Gm. It was distilled undet 15 Mm. pressure, when it passed over as a nearly colourless oil, which solidified on cooling. On crystallisation from ethyl acetate it separated in small, lustrous leaflets, melting at 74°-75°. 01334 gave 0 4156 C02 and 0 1782 H20. C = 84'9 ; H = 14-8. C^H^ requires C = 85‘4 ; H = 14'6 per cent. The above substance was thus identified as pentatriacontane. The alcoholic mother-liquors from the pentatriacontane were concentrated to about 250 C.c., and allowed to stand, when a further quantity of this hydrocarbon separated. This was removed, and the filtrate evaporated to a small bulk, when, after standing for some time, a solid separated in the form of plates. The latter, when collected and dried, amounted to 0’5 Gm. This substance was crystallised twice from a mixture of ethyl acetate and dilute alcohol, when it formed colourless laminte, melting at 133°-134°, and gave the colour reactions yielded by the phytosterols. 0-1042, on heating at 110°, lost 0'0052 H20. H20 = 4 9. 0 0590 of anhydrous substance gave 0'1820 C02 and 00662 H20. C = 84 1 ; H = 12-4 C^H^O, I120 requires H20 = 45 per cent. G27H46O requires C = 839 ; H = 11'9 per cent. This substance was thus identified as a phytosterol. Its specific rotatory power was determined with the following result:— 00990 of anhydrous substance in 20 C.c. of chloroform gave «d — 0J 20' in a 2-Dcm. tube, whence [a]d —33-6°. The alkaline, aqueous liquid, from which the above-mentioned substances had been removed by means of ether, was acidified and distilled with steam. The distillate was a slightly opalescent, acid liquid, and contained a few oily drops floating on the surface. It was, therefore, extracted with ether, which removed a small amount of an oily acid, from which a silver salt was prepared. The latter was analysed with the following result:— 02958 of salt gave on ignition 01568 Ag. Ag = 530. C4H702 Ag requires Ag = 554 per cent. C5Hg02 Ag requires Ag = 517 per cent. The above-mentioned oily acid was, therefore, evidently a mixture. After extraction with ether the distillate was found to contain small amounts of formic and butyric acids. The liquid remaining in the distillation flask contained a