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The addition of ketene to cyclopentadiene and 1,3-cyclohexadiene has been found to afford unsaturated bicyclic ketones derived from bicyclo [3.2.0]heptane and bicyclo [4.2.0]octane, respectively. The saturated ketone derived from the ketenecyclopentadiene adduct yields e¿s-cyclopentane-l,2-dicarboxylic acid on oxidation. Complete reduction of the ketenecyclohexadiene adduct gave the previously described bicyclo [4.2.0]octane. A number of compounds containing the bicyclo-[3.2.0]heptane and bicyclo[4.2.0]octane ring structures are described.