Researchers from Canada and Mexico studied the oxidation of o-isopropylphenol using lead tetraacetate, which produced a dienone acetate. This dienone acetate can dimerize and represents a core structure found in natural celastroidin terpenes from the plant Hippocratea Celastroides. Using various analytical techniques, the researchers identified six oxidation products, including the dienolone acetate and two dimer structures. Comparing the synthetic and natural product dimers, they determined that the natural product dimer corresponded to the photochemical pathway product, while the synthetic dimer had the opposite geometry, as confirmed by molecular modeling. Oxidation of o-cresol produced similar products.