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Any unsaturated hydrocarbon of the formula C10H16 found in essential oils and oleoresins. Terpenes are based on five carbon isoprene unit. They are classified as monocyclic (dipentene), dicyclic (pinene) or aliphatic (myrcene). Examples of terpene derivatives, or terpenoids are: Camphor, Menthol, Terpineol, Borneol, and geraniol.

Synonyms and Related Terms

1-methyl-4-(1-methylethyl)-1,4-cyclohexadiene; terpeno (Esp.); terpène (Fr.); terpinene

Chemical structure



  • Combustible. Flash point = 51C
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Miscible with ethanol, ether. Insoluble in water.

Composition C10H16
CAS 99-85-4
Density 0.8490 g/ml
Molecular Weight mol. wt. = 136.24

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 297
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 9315
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998

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