This sesquiterpene, first found by Tresh2) in ginger oil, was later examined by v.Soden and Rojahn,3) also bySchreinerand Kremers.4) The last mentioned investigators ascertained the following constants:
B. p. abt. 270° (with decomposition), 160 to 161° (32 mm.); d20o 0,8731; [a]D - 73,38°; nD 1,49399.
The nitrosochloride melts at 96 to 97°, the nitrosite at 97 to 98°, the nitrosate at 86 to 88° and the dihydrochloride at 168 to 169°. For the characterization of this hydrocarbon its di-hydrochloride can be prepared by passing hydrogen chloride into its solution in glacial acetic acid. After standing for two days, it crystallizes out in fine needles. The nitrosate also can be used for its identification since, according to Schreiner and Kremers, the yield obtained almost equals the theoretical yield.