Properties. Swedish pine tar oil has the same properties as the other oils obtained by the destructive distillation of pine stumps. The constants obtained thus far from five samples only, are as follows: d15o0,863 to 0,871; aD + 6°30' to +17°45'. One of the samples examined contained about 1 p.c. of phenols.
Composition. According to an investigation made by Atter-berg5) the oil contains d-a-pinene boiling between 156,5 and 157,5° (m. p. of pinene chlorhydrate 131°) and a terpene previously unknown, which boiled between 173 and 175°, which he characterized by means of a dichlorhydrate melting at 72 to 73° and which he named sylvestrene.
1) Berl. Berichte 20 (1887), 1956.
2) In the presence of terpenes this proof does not hold strictly true.
3) Liebig's Annalen 230 (1885), 246. 4) Chem. Ztg. 32 (1908), 8.
5) Berl. Berichte 10 (1877), 1202. Comp. Wallach, Liebig's Annalen 230 (1885), 240.
A communication concerning Swedish turpentine oil by J. Kondakow and ). Schindelmeiser1) presumably pertains to pine tar oil since nothing is known concerning a turpentine industry in Sweden. In addition to sylvestrene and dipentene, these investigators found a hydrocarbon boiling between 174 and 176° (aD + 0°; d19o 0,854; nD 1,49013) which did not react with hydrogen chloride and which upon oxidation with permanganate yielded hydroxy isopropyl benzoic acid (m. p. 155°). In addition the cymene sulphonic acid was identified by means of its barium salt, hence the hydrocarbon may be regarded as p-cymene. The same oil yielded upon fractionation a hydrocarbon that boiled at 145° which has not yet been identified.