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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    is a crystalline solid, volatile with steam, melting at 30° and boiling at 294°. It dissolves in strong sulphuric acid with a characteristic blood-red colour. By boiling it with alcoholic potash the allyl group suffers rearrangement, and isoapiol, the isomeric methylene-dimethyl ether of propenyl-tetroxy- benzene, results. This is also a crystalline solid, forming leaflets melting at 56° and boiling at 304°. In 1896 Ciamician and Silber announced the discovery of an isomeric apiol, which they separated from the high boiling fractions of oil of dill. It is an oily liquid, boiling at 285° with slight decomposition. When boiled with alcoholic potash it yields the so-called iso-dill-apiol, which differs from it in containing the propenyl instead of the allyl group. This body melts at 44° and boils at 296° with slight decomposition. A close study of these bodies has made it clear that the two isomeric apiols possess the formulae— where the numbers refer to the relative position of the radicles in the benzene nucleus. Which represents ordinary apiol and which dill apiol is not yet determined. Here the C3H5 is the allyl group. The iso-apiols are of the same constitution, except that the C3H5 group represents the propenyl radicle in each case. Diosphenol, CjQH]^g0.2, is a constituent of the oil of buchu leaves. It was originally discovered by Fliickiger. It was originally looked upon as an oxycamphor, but it is now regarded as a phenol-aldehyde. It forms colourless crystals, melting at 82° and boiling at 232°. It forms an oxime, CgHi^fOHlCH : NOH, melting at 156°, and a phenylhydra- zone, which can only be solidified at low temperatures. It shows, in fact, all the general characters of an aldehyde, as ( O2CH2 (5 and 4) r\“n or /o\ (OCH3 (5) r IT (4 and 3) ■ 0CH3^ (2) iCsHg (1),
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