Oleum Foliorum Cedri. - Cedernblatterol. - Essence des Feuilles de Cedre.
Origin. According to observations made in the laboratory of Fritzsche Bros.2), the cedar leaf oil of the American market is never what it ought to be, viz. the oil from the leaves of Juni-perus virginiana, L. This is partly due to the fact that in North America the term cedar is applied to two distinct trees, viz. to Juniperus virginiana and to Thuja occidentalis. It is true that these two species are differentiated as "red" and "white" cedar. The distillers of the oil, however, pay no attention to this distinction and use the leaves of both species, frequently even with the leaves of other conifers. Hence the cedar oil of commerce reveals appreciable differences in its properties.
1) Semmler and Risse, Berl. Berichte 45 (1912), 355. -) Report of Schimmel & Co. April 1898, 14.
Genuine cedar leaf oil is but rarely distilled. In one instance the yield amounted to 0,2 p. c.1).
Properties. d15O 0,8872) to 0,9002); aD + 59°25'; S. V. 10,9; E. V. after acetylation 39,1. It was not soluble in 10 vols, of 80 p. c. alcohol. The odor was pleasant, somewhat sweetish. When fractionated, the bulk distilled below 180°.
The specific gravities of a number of commercial oils varied between 0,863 and 0,920; the angle of rotation between - 3°40' and - 24° 10'. Some of these oils were soluble in 4 or 5 vols, of 70 p. c. alcohol, others not. All of these commercial oils had a more or less thuja-like odor.
Composition3). The lowest fractions appear to contain a-pinene (nitrosochloride). One fraction (b. p. 173 to 176°; aD + 89°) consisted almost entirely of pure d-limonene (m. p. of tetrabromide 104 to 105°). The higher boiling fractions contained borneol (m. p. 103 to 104°), partly free, partly as ester (valeric acid?). The highest fractions contained cadinene (hydrochloride).