The constituents of the essential oil from the fruit of Pittosporum undulatum / by Frederick B. Power and Frank Tutin.

  • Frederick Belding Power
Date:
[1906]
Catalogue details

Licence: In copyright

Credit: The constituents of the essential oil from the fruit of Pittosporum undulatum / by Frederick B. Power and Frank Tutin. Source: Wellcome Collection.

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    optically inactive sesquiterpenes, as will be seen from the following comparison of their properties : Sesquiterpene from Humulene. Limene. l’ittosporum oil. Boiling point (ordinary 262—263° (uncorr.) 263—264° (corr.) pressure) . 263—266°(corr.) Density, 150/15°. 0-9001 0-873 0-9100 Refractive index, rif ... 1-5021 1-4910 1-5030 Hydrochloride .••• Liquid Crystals, m. p. Liquid. 79-80° Nitrosochloride . M. p. 164—165° “ UnsatiVactory ” Could not be oh- tained. Nitrosite .. ,, 120—121 ? > > } Nitrosate. , 162—163 — } 5 The sesquiterpene obtained from the essential oil of the fruit ot Pittosporuin imdulaturn may thus be regarded as a compound which has not hitherto been described. Its molecular refraction indicates that it belongs to the group of dicyclic sesquiterpenes with two ethylenic linkings, which also includes humulene (Trans., 1895, 67, 60, 780), wiiereas the other known optically inactive sesquiterpene, limene, evidently belongs to the group of monocyclic compounds with three ethyleuic linkings (l’rans., 1904, 85, 416; Ber., 1906, 39, 657). Acids obtained by the Hydrolysis of the Oil. The strongly alkaline aqueous liquid which was separated from the hydrolysed oil, as previously described, was freed from adhering oil by shaking with ether. It was then acidified with sulphuric acid and again extracted with ether, the ethereal liquid well washed with water, dried, and the ether removed. A brown, oily liquid was thus obtained, which possessed a strong odour of valeric acid, and amounted to about 2 grams. The acids contained in this liquid were converted into the potassium salts, from which, by the addition of silver nitrate, the corresponding silver salts were precipitated in eight fractions. These were washed, dried in a vacuum over sulphuric acid, and analysed : Fraction 1. 0-1570 of silver salt gave 0'0700 Ag. a 11. 0 2372 a „ „ 0-1170 Ag. a III. 0-2210 a „ „ 0 1132 Ag. a IV. 0-2073 a „ „ 0-1064 Ag. a V. 0-1746 a ,, „ 0-0900 Ag. . >> VI. 0-1112 a „ „ 0 0577 Ag. >> VII. 0-1435 a „ „ 0-0748 Ag. a VIII. 0-1173 a „ „ 0 0615 Ag. C.H90oAg requires Ag = 5L67 per cent. Ag = 44-58. Ag = 49*32. Ag = 51*22. Ag = 5T33. Ag = 51*54. Ag = 51 *89. Ag = 52T3. Ag = 5243.
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