Terpinolene
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Terpinolene
Terpinenes
Alpha terpinene.png
?-Terpinene
Beta terpinene.png
?-Terpinene
Gamma terpinene.png
?-Terpinene
Terpinolene.svg
?-Terpinene
(terpinolene)
Names
IUPAC names
?: 4-Methyl-1-(1-methylethyl)-1,3-cyclohexadiene
?: 4-Methylene-1-(1-methylethyl)cyclohexene
?: 4-Methyl-1-(1-methylethyl)-1,4-cyclohexadiene
?: 1-Methyl-4-(propan-2-ylidene)cyclohex-1-ene
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.029.440 Edit this at Wikidata
UNII
Properties
C10H16
Molar mass  g·mol-1
Density ?: 0.8375 g/cm3
?: 0.838 g/cm3
?: 0.853 g/cm3
Melting point ?: 60-61 °C
Boiling point ?: 173.5-174.8 °C
?: 173-174 °C
?: 183 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
?Y verify (what is ?Y?N ?)
Infobox references

The terpinenes are a group of isomeric hydrocarbons that are classified as monoterpenes. They each have the same molecular formula and carbon framework, but they differ in the position of carbon-carbon double bonds. ?-Terpinene has been isolated from cardamom and marjoram oils, and from other natural sources. ?-Terpinene has no known natural source but has been prepared from sabinene. ?-Terpinene and ?-terpinene (also known as terpinolene) have been isolated from a variety of plant sources. They are all colorless liquids with a turpentine-like odor.[1]

Production and uses

?-Terpinene is produced industrially by acid-catalyzed rearrangement of ?-pinene. It has perfume and flavoring properties but is mainly used to confer pleasant odor to industrial fluids. Hydrogenation gives the saturated derivative p-menthane.[1]

Biosynthesis of ?-terpinene

Biosynthesis of ?-terpinene.[2] "P" indicates a phosphate group, -PO32-

The biosynthesis of ?-terpinene and other terpenoids occurs via the mevalonate pathway because its starting reactant, dimethylallyl pyrophosphate (DMAPP), is derived from mevalonic acid.

Geranyl pyrophosphate (GPP) is produced from the reaction of a resonance-stable allylic cation, formed from the loss of the pyrophosphate group from DMAPP, and isopentenyl pyrophosphate (IPP), and the subsequent loss of a proton. GPP then loses the pyrophosphate group to form the resonance-stable geranyl cation. The reintroduction of the pyrophosphate group to the cation produces GPP isomer, known as linalyl pyrophosphate (LPP). LPP then forms a resonance-stable cation by losing its pyrophosphate group. Cyclization is then completed thanks to this more favorable stereochemistry of the LPP cation, now yielding a terpinyl cation. Finally, a 1,2-hydride shift via a Wagner-Meerwein rearrangement produces the terpinen-4-yl cation. It is the loss of a hydrogen from this cation that generates ?-terpinene.

Plants that produce terpinene

References

  1. ^ a b M. Eggersdorfer (2005). "Terpenes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a26_205. ISBN 3527306730.CS1 maint: uses authors parameter (link)
  2. ^ Dewick, P. M. (2009). Medicinal Natural Products: A Biosynthetic Approach. United Kingdom: John Wiley & Sons. pp. 187-197.
  3. ^ Li, Rong; Zi-Tao Jiang (2004). "Chemical composition of the essential oil of Cuminum cyminum L. from China". Flavour and Fragrance Journal. 19 (4): 311-313. doi:10.1002/ffj.1302.
  4. ^ Wang, Lu; Wang, Z; Zhang, H; Li, X; Zhang, H; et al. (2009). "Ultrasonic nebulization extraction coupled with headspace single drop microextraction and gas chromatography-mass spectrometry for analysis of the essential oil in Cuminum cyminum L.". Analytica Chimica Acta. 647 (1): 72-77. doi:10.1016/j.aca.2009.05.030. PMID 19576388.
  5. ^ Iacobellis, Nicola S.; Lo Cantore, P; Capasso, F; Senatore, F; et al. (2005). "Antibacterial Activity of Cuminum cyminum L. and Carum carvi L. Essential Oils". Journal of Agricultural and Food Chemistry. 53 (1): 57-61. doi:10.1021/jf0487351. PMID 15631509.
  6. ^ Hillig, Karl W (October 2004). "A chemotaxonomic analysis of terpenoid variation in Cannabis". Biochemical Systematics and Ecology. 32 (10): 875-891. doi:10.1016/j.bse.2004.04.004. ISSN 0305-1978.
  7. ^ Shahwar, Muhammad Khuram; El-Ghorab, Ahmed Hassan; Anjum, Faqir Muhammad; Butt, Masood Sadiq; Hussain, Shahzad; Nadeem, Muhammad (2012-07-01). "Characterization of Coriander (Coriandrum sativum L.) Seeds and Leaves: Volatile and Non Volatile Extracts". International Journal of Food Properties. 15 (4): 736-747. doi:10.1080/10942912.2010.500068. ISSN 1094-2912.

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Terpinolene
 



 



 
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