The sesquiterpenes : a monograph / by Oswald Schreiner.

  • Schreiner, Oswald, 1875-
Date:
1904
Catalogue details

Licence: In copyright

Credit: The sesquiterpenes : a monograph / by Oswald Schreiner. Source: Wellcome Collection.

    125/140 page 117
    45. Sesquiterpene of Peppermint Oil, English. Eliickiger and Power1 separated from dementholized Mitcham oil of peppermint, a fraction which after repeated rectification over metallic sodium had the following properties: B. p. 255—260°; d2i° = 0.912; «„= + <>°2'. Analysis agreed fairly well with the formula C15H24. Although the oil was dextrogyrate it is possible that it was identical with the cadinene found in the American oil bv Schimmel & Co.2 v / a// A. __ ' 46. Sesquiterpene of Peppermint Oil, Japanese. Beckett and Wright3 * examined Japanese oil of peppermint and, after separating the menthol, they obtained a fraction boiling at 245—255°. This they supposed to be a compound C30H50O formed by splitting off two molecules of water from three molecules of the com- pound CioHisO (menthone?) BCioHist) — C30H50O + 2HaO. It is more probable that the fraction consisted of a sesquiterpene (found in both English and American oils) mixed with an oxygenated constituent. 47. Sesquiterpene of Pimenta Oil. In 1864, Oeser1 investigated pimenta oil. He dissolved the oil in caustic p itish and then treated it with water. On heating slightly, an indifferent oily layer separated. This oil, after having- been dried and rectified, had the following properties: B. p. 255°; d8° = 0.98 ; [«] j =-0.49°. Analysis showed it to have the formula (CsHsCx and on account of -its high boiling point Oeser gave it the formula C15H04. Oeser further thinks that it is identical with the hydrocarbon found by Williams5 * and earlier by Bridling0 and by Ettling7 in oil of cloves. This, however, appears not to be the case, as the specific gravity of the hydrocarbon from cloves, now known as caryophyl- lene, is much less than that of the hydrocarbon from pimenta oil. A more thorough investigation of this hydrocarbon would doubtless prove interesting. 1 Pharm. .Tourn., (2). 11. p. 22; Arch. (I. Pharm., 21S, p. 222. - Ber. v. S. & Co., Apr. 1894. p. 42. 3 Journ. Chem. Hoc., 1876, I, p. 3. * Ann., 131, p. 277. •r> Ann.. 107, p. 242. e Ann.. 104. p. 202. 7 Ann., 9, p. 68.
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