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. Beta-Phellandrene is widely distributed in essential oils (Angelica, Eucalyptus, Lavandula, Mentha, Pinus species).
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. Consequently, beta-Phellandrene is widely used in flavor industry.