α-Phellandrene and β-phellandrene are isomeric compounds that are minor constituents of spearmint oil; they have the molecular formula C10H16. Each compound has a UV absorption maximum in the 230-270 nm range. On catalytic hydrogenation, each compound yields 1-isopropyl-4-methylcyclohexane. On vigorous oxidation with potassium permanganate, a-phellandrene yields

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CO2H andCO2H. A similar oxidation of B-phellandrene yields OH CO2H CO / 2H as the only isolable product. Propose structures tor α-and β-phellandrene.