P-cymene is a monoterpene that is toluene substituted by an isopropyl group at position 4. It has a role as a plant metabolite, a volatile oil component and a human urinary metabolite. It is a member of toluenes and a monoterpene.
Cymene, or p-cymene, is a naturally occurring aromatic organic compound. It is classified as a hydrocarbon related to a monoterpene. Its structure consists of a benzene ring para-substituted with a methyl group and an isopropyl group. It is insoluble in water, but miscible with ethanol and ether. Cymene is a constituent of a number of essential oils, most commonly the oil of cumin and thyme. There are two less common geometric isomers. o-Cymene, in which the alkyl groups are ortho-substituted, and m-cymene, in which they are meta-substituted. p-Cymene is the only natural isomer. Cymene is common ligand for ruthenium. The parent compound is [(& #951; 6-cymene)MCl2]2. This [sandwich compound|half-sandwich compound is prepared by the reaction of ruthenium trichloride with the terpene & #945; -phellandrene. The osmium complex is also known .