Picamar

Picamar is a colorless, hydrocarbon oil extracted from the creosote of beechwood tar with a peculiar odor and bitter taste. It consists of derivatives of pyrogallol. It was discovered by German chemist Carl Reichenbach in the 1830s. Picamar can be used to lubricate machinery.

Chemical and physical properties

The exact composition of picamar is unknown.[1] According to Pastrovich, picamar is a monomethyl ether of propyl-pyrogallol (C
10H
14O
3). However, Gustav Niederist, who obtained an original sample of the oil as prepared by von Reichenbach himself, assigned it a formula of C
13H
18O
4.[2][3] Picamar is colorless with a peculiar, peppermint-like odor and bitter taste. It is soluble in alcohol and sparingly soluble in water. It has a melting point of 545 °F (285 °C). Picamar reduces the red oxide of mercury to its metallic state.[4] It reacts with nitric acid to become a reddish-brown, greasy substance and can also dissolve camphor, resin, and benzoic acids.[5]

History

The name "picamar" is derived from the Latin phrase in pice amarum (meaning "bitter principle of tar").[6] It was discovered by German chemist Carl Reichenbach in the 1830s as one of the six principles of beechwood tar, along with other substances as capnomor and eupione that were "met with less notice".[7]

Applications

Picamar is used for greasing machinery and preventing them from rusting.[8]

References
  1. William Gregory (1851). Outlines of Chemistry: For the Use of Students. H.W. Derby. p. 538.
  2. Chemical Society (Great Britain) (1883). Journal of the Chemical Society. The Society. pp. 1005–1006.
  3. Society of Chemical Industry (Great Britain) (1884). Journal of the Society of Chemical Industry. Society of Chemical Industry. p. 162.
  4. William Thomas Brande (1841). A Manual of Chemistry. J.W. Parker. p. 1169.
  5. Leopold Gmelin (1862). Hand-book of Chemistry. Cavendish Society. p. 163.
  6. Richard Dennis Hoblyn (1865). A Dictionary of Terms Used in Medicine and the Collateral Sciences. H.C. Lea. p. 342.
  7. "Letters on Od and Magnetism" (PDF). 1851. p. 63.
  8. Edward Turner (1834). Elements of Chemistry: Including the Recent Discoveries and Doctrines of the Science. John Taylor. p. 874.
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