Basketene (IUPAC name: pentacyclodec-9-ene) is an organic compound with the formula C10H10. It is a polycyclic alkene and the dehydrogenated version of basketane, which was named for its structural similarity to a basket. Basketene (IUPAC name: pentacyclodec-9-ene) is an organic compound with the formula C10H10. It is a polycyclic alkene and the dehydrogenated version of basketane, which was named for its structural similarity to a basket. Basketene has been synthesized by the isomerization of cyclooctatetraene followed by a Diels–Alder reaction with maleic anhydride. cycloaddition closes the cage structure, which is converted to basketene by saponification and decarboxylation. Photolysis of basketene produces cyclooctatetraene, Nenitzescu's hydrocarbon and so on.