The chemistry of essential oils and artificial perfumes / by Ernest J. Parry.

  • Parry, Ernest J. (Ernest John)
Date:
1908
Catalogue details

Licence: In copyright

Credit: The chemistry of essential oils and artificial perfumes / by Ernest J. Parry. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    however, by several reactions, such, for example, as that mentioned above, viz., the withdrawal of HC1 from pinene monohydrochloride, or by the action of heat in the presence of acetic anhydride on bornylamine, Ci0H17NH2, which causes the withdrawal of ammonia and leaves camphene, as follows:— C10H17NH2 = C10H16 + NH3. It has been recognised in various oils by its ready con- version into isoborneol by the action of sulphuric and glacial acetic acids. It is present in small quantity in many oils in which pinene is found, but not in sufficient quantity to allow its isolation. Camphene is a crystalline hydrocarbon, melting, according to Wallach, at 48° to 49° and boiling at 160° to 161°. Bruhl, however, has found specimens made from pinene melting at 51° to 52°, and from bornyl chloride melting at 53*5° to 54°. The higher melting point is probably correct. The specific gravity of melted camphene is 0*850 at 48° according to Wallach and 0*8422 at 54° according to Bruhl. Its refractive index is 1*4621. The optical rotation of camphene is a matter of consider- able uncertainty. It exists in the inactive as well as the dextro- .and Zaevo-rotary varieties. Zelinski has isolated the terpene from Bussian oil of turpentine, with a rotation of - 70° 45', but as he could not obtain a nitrosochloride from it, it was probably impure. Bouchardat isolated a laevo-rotary speci- men with [a] d = - 803 36', whilst Schindelmeiser isolated a specimen from Pinus Siberica with [a]d = -94° 30'; but as this melted at 40°, the figure is of little value. Wallach finds - 85°, whilst the rotation of pure synthetic camphene is + 104°. It is known in the inactive, as well as in the dextro- and laevo-rotary forms. The compounds of camphene are less stable than those of pinene, and have not, in many cases,