The chemistry of essential oils and artificial perfumes : illustrated with engravings / by Ernest J. Parry.

  • Parry, Ernest J. (Ernest John)
Date:
1899
Catalogue details

Licence: Public Domain Mark

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

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    then melts at 103° and is optically inactive. By the action of alcoholic solutions of various amines on the nitrosochloride, characteristic nitrolamines are formed, of the general formula NO NHE where R is the amine radicle. Of these pinene nitrol-piperidine melts at 118° and pinene nitrol-benzylamine at 122°. By treating pinene nitrosochloride with alcoholic potash nitroso- pinene CigH^gNO is obtained. This body forms monoclinic crystals melting at 132°. The action of bromine on pinene gives rise to a solid di-bromide nielting at 169°, and possibly to a liquid tetrabromide. The exact constitution of pinene is still a matter of doubt, but the most probable formula for this, and those for several of the other terpenes, are given below. Camphene.—This is the only solid terpene known. It occurs to a small extent in a few essential oils, such as citronella, ginger and camphor oils. It is prepared artificially, however, by several reactions, such, for example, as that mentioned above, viz., the withdrawal of HCl from pinene monohydrochloride, or by the action of heat in the presence of acetic anhydride on bornylamine, CiqHitNII,, which causes the withdrawal of ammonia and leaves camphene, as follows:— C,oHi,NH, = + NH3. Camphene is a crystalline body, melting, according to Wallach, at 48° to 49°, according to Brfihl, at 51° to 54°. It boils at about 160°. It is known in the inactive, as well as in the dextro- and laevo-rotary forms. A sample prepared by Bouchardat {Gomptes rendus, civ., p. 693) was laevo-rotary [a]^ = - 80-6°. The compounds of camphene are less stable than those of pinene, and have not, in most cases, been pre- pared in a pure state. CioHxe: