Chemical compound From Wikipedia, the free encyclopedia
Ocimenes are a group of isomeric hydrocarbons. The ocimenes are monoterpenes found within a variety of plants and fruits. α-Ocimene and the two β-ocimenes differ in the position of the isolated double bond: it is terminal in the alpha isomer. α-Ocimene is cis-3,7-dimethyl-1,3,7-octatriene. β-Ocimene is trans-3,7-dimethyl-1,3,6-octatriene. β-Ocimene exists in two stereoisomeric forms, cis and trans, with respect to the central double bond.
 α-Ocimene | |
-beta-Ocimene.svg) cis-β-Ocimene | |
-beta-ocimene.svg) trans-β-Ocimene | |
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| IUPAC names
α: (3E)-3,7-Dimethylocta-1,3,7-triene cis-β: (3Z)-3,7-Dimethylocta-1,3,6-triene trans-β: (3E)-3,7-Dimethylocta-1,3,6-triene | |
| Identifiers | |
3D model (JSmol) |
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| ECHA InfoCard | 100.034.205 |
PubChem CID |
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| Properties | |
| C10H16[1] | |
| Molar mass | 136.24 g/mol |
| Density | 0.800 g/cm3 |
| Melting point | 50 °C (122 °F; 323 K) |
| Boiling point | mix of isomers: 100 °C at 70 mmHg |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The ocimenes are often found naturally as mixtures of the various forms. The mixture, as well as the pure compounds, are oils with a pleasant odor. They are used in perfumery for their sweet herbal scent and are believed to act as plant defense and have anti-fungal properties.[2] Like the related acyclic terpene myrcene, ocimenes are unstable in air.[3] Like other terpenes, the ocimenes are nearly insoluble in water, but soluble in common organic solvents.
The name is derived from the plant genus name Ocimum[4] from the Ancient Greek word for basil, ὤκιμον (ṓkimon).
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