44 . REPORT OF SCHIMMEL & Co. OCTOBER 1914.) APRIL 1915. 
Spoonwort Oil, see Cochlearia Oil, p. 64. 
Tobacco Oil. By heating 300 kilos of Hungarian tobacco of medium quality with 
an organic solvent, W. Halle and E. Pribram*) succeeded in obtaining 140 g. (=0,047 p.c.) 
of a yellowish oil of an overpoweringly strong smell of tobacco. It was entirely free 
from nitrogen, gave an acid reaction with litmus and boiled from 77 to 100° (26 mm.). 
Although it had been previously shaken with soda solution, it again showed an acid 
reaction after distillation. By its odour, determination of boiling point and density, 
titration and analysis of the barium salt this acid was recognized as isovaleric acid. 
In a fraction boiling from 72 to 82° (18 mm.) a hydrocarbon was present, to which 
possibly the formula CioHis or Cii1Heo may have to be assigned. This hydrocarbon 
yields as a resolution product an acid which is insoluble in chloroform, and which 
appears to be identical with terephthalic acid; furthermore an acid soluble in chloro- — 
form, presumably isobutylacetic acid. Tobacco oil also contains an oxygenous high- 
boiling fraction. 
Turpentine Oil. From our reference on page 95 of our previous Report to a 
paper by W. Steinkopf and M. Freund about the influence of aluminium chloride on 
turpentine oil, the impression might prevail that CeEngler and his collaborators were 
the first to study polymerisation of hydrocarbons under the influence of aluminium 
chloride. In reality this reaction was first described by F. Heusler as far back as 18967). 
A. Heiduschka®) reports on the bromine heating value of turpentine oil. He mixed 
20 cc. of a solution of the turpentine oil to be examined with chloroform in a Weinhold 
(Dewar) vacuum vessel, ascertained the temperature of the solution, added 1 cc. of 
bromine and then read off the highest temperature. Considerable differences were 
found between laevo- and dextro-rotatory turpentine oils. In Heiduschka’s opinion 
this method might be found useful in analyses for purity of turpentine oils, but a 
considerable number of experimental results will have to be collected first. 
Further, a paper by C. Grimaldi and L. Prussia*) has to be mentioned, describing 
the determination of petroleum derivatives and benzene hydrocarbons in turpentine oil 
by means of mercuric acetate. For this purpose 75 g. of mercuric acetate are placed 
in a flask with graduated neck, and of 500 cc. capacity, along with 200 cc. of distilled 
water, 100 cc. glacial acetic and 10 cc. of the oil to be examined. The flask, which 
is connected with a reflux condenser, is heated for two hours in a water bath of 80° 
and shaken repeatedly. After cooling it is filled up to zero point with dilute nitric 
acid. The quantity of unattacked oil may be read off easily. In this treatment pure 
turpentine oil is oxidized away, inasmuch as it consists chiefly of pinene, which is 
attacked, forming a dioxypinene’*). Adulterants, such as petroleum distillates or benzene 
hydrocarbons, are not attacked, or only in part. 
Wherever great correctness is not absolutely necessary, this method is Big to 
be successfully applied. It is more especially useful whenever small quantities only 
are at the disposal of the analyst, as f.i. in the examination of varnish solvents. 
The application of this method for the analysis and determination of tar derivatives 
used in the adulteration of turpentine oil (benzene, xylene, toluene) had not Sgt 
any satisfactory results so far. 
1) Berl. Berichte 47 (1914), 1394. — %) Zeitschr. f. angew. Chem. 9 (1896), 292, 318. — *) Chem. Ztg. 38 
(1914), 441. — *) Annal. di Chim. applic. 1 (1914), 324. — Chem. Ztg. 88 (1914), 1001. — 5) Comp. Report — 
April 1903, 83; April 1904, 100; October 1906, 101. 
