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.

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    members of the ten- and fifteen-carbon groups at least have powerful odors, and rotate the plane of polarization strongly, sometimes in one, sometimes in the other direction.” Based on the different properties of the nitroso compounds, Tilden22 in 1877 divided the terpenes, CioHie, into two groups, as follows: 1. Turpentine group. Boiling point 156—160°; melting point of nitroso derivatives 124°; they form solid crystalline hydrated terpin C10H20O2. Hot). 2. Orange group. Boiling point 174—176°; melting point of nitroso derivatives 71°; form (by Wigger’s process) no solid crystalline terpin hydrate.23 Of the individual members of the group Tilden says: “The liquids included in each group are allotropic modifications of the same hydrocarbon, distinguished one from another by their various rota- tory action on the polarized ray.” In 1878 Tilden24 set up the following formula to explain the constitution of the terpenes, which is of interest as he proposes a classification of the terpenes, CioHia, in connection with it: CsH- H H CH3 H H I I I I I I H — 0 = 0 — U = C — 0 = C — H I. a a' II. >*> /- f hi. r r According to the boiling points, specific gravity, and the action of certain agents, especially nitrosvl chloride, he divides the terpenes into the three classes indicated above: 22 Pharm. Journ.. 37, p. 191. 23 This statement is not correct. Both dipentene and limonene produce terpin hydrate. Comp. Fliiekiger, Arch. d. Pharm., 222, p. 362; also Kremers, Am. Chem. Journ., 15, p. 695. 2* Ber., 11, p. 152.