Phellandrene

Template:Chembox header| Phellandrenes
α-Phellandreneβ-Phellandrene
Chemical name	α: 2-methyl-5-(1-methylethyl)- 1,3-cyclohexadiene β: 3-methylene-6-(1- methylethyl)cyclohexene
Chemical formula	C10H16
Molecular mass	136.24 g/mol
CAS number	α: [99-83-2] β: [555-10-2]
Density	α: 0.846 g/cm3 β: 0.85 g/cm3
Melting point	α: 125-126°C
Boiling point	α: 171-172 °C β: 171-172 °C
SMILES	α: CC(C)C1CC=C(C)C=C1 β: CC(C)C1CCC(=C)C=C1
Template:Chembox header | Disclaimer and references

Phellandrene is the name for a pair of organic compounds that have a similar molecular structure and similar chemical properties. α-Phellandrene and β-phellandrene are cyclic monoterpenes and are double bond isomers. In α-phellandrene both double bonds are endocyclic and in β-phellandrene one of them is exocyclic. Both are insoluble in water, but miscible with ether.

α-Phellandrene is a constituent of the essential oils of Eucalyptus dives and of Eucalyptus phellandra (hence the name). β-Phellandrene has been isolated from the oil of water fennel and Canada balsam oil.

The phellandrenes are used in fragrances because of their pleasing aromas. The odor of β-phellandrene has been described as peppery-minty and slightly citrusy.