| Phellandrene is the name for a pair of organic compounds that have a similar molecular structure and similar chemical properties. alpha Phellandrene and beta phellandrene are cyclic monoterpenes and are double-bond isomers. In alpha phellandrene, both double bonds are endocyclic and in beta phellandrene, one of them is exocyclic. Both are insoluble in water, but miscible with ether. alpha-Phellandrene was named after Eucalyptus phellandra, now called Eucalyptus radiata, from which it can be isolated. It is also a constituent of the essential oil of Eucalyptus dives. beta-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 beta phellandrene has been described as peppery-minty and slightly citrusy. The alpha phellandrene isomer can form hazardous and explosive peroxides on contact with air at elevated temperature. Phellandrene also can be used as insect-resist & insecticide, materials of terpenic resin and synthetic menthol. |
