A-Phellandrene; P-Mentha-1,5-Diene; α-Phellandrene; R-(-)-1,5-Menthadiene; 2-Methyl-5-Isopropyl-1,3-Cyclohexadiene; 1-Isopropyl-4-Methyl-2,4-Cyclohexadiene; 5-Isopropyl-2-Methyl-1,3-Cyclohexadiene

Brief Introduction

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 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. 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. The α-phellandrene isomer can form hazardous and explosive peroxides on contact with air at elevated temperatures.

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