From the leaves of the white pine, Pinus Strobus, L. (Ger. Weymouthkiefer) collected during January in Wisconsin, E. Kremers1) obtained 0,09 p.c. of volatile oil that boiled between 155 and 285°. In the first fraction, 155 to 170°, constituting 30 p.c. of the oil, a-pinene was contained (m. p. of nitroso-chloride 105 to 106°).
1) Pharm. Review 14 (1896), 35.
2) Kremers, Pharm. Rundsch. 13 (1895), 135.
3) Hunkel, Americ. Journ. Pharm. 67 (1895), 9.
Later J. Troger and A. Beutin2) examined an oil distilled from spring shoots collected in Blankenburg in the Hartz mountains. It possessed the following properties: d15o0,9012; optical rotation in a 200 mm. tube - 39,7°; nD20o 1,48274; ester content 8,6 p.c. (computed as C10H17O-Cochs); ester content after acetylation 15,25 p.c. corresponding to 5,2 p.c. of free alcohol in the original oil. Of 30 g. of oil 19 g. distilled over below 70° under 24 mm. pressure and boiled between 154 and 170° under atmospheric pressure. No terpenes in addition to /-a-pinene (m. p. of nitrol-benzylamine 122°) were identified. The fraction above 70° had an ester content of 23,5 p.c. In the acetylated oil the ester content had risen to 57,6 p.c. Attempts to isolate the alcohol gave negative results.