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The reactions of carbon monoxide with tetramethylenedilithium, hexamethylenedilithium and pentamethylenedilithium at −70°C have yielded the corresponding poly-ketones (monomer unit: –CO(CH2)n−,n=4,5 and 6) and cyclic ketones (cyclopentanone, cyclohexanone and cycloheptanone). In these reactions, high dilutions of polymethylenedilithiums with a solvent (diethyl ether) lead to the formation of cyclic ketones in good yields. For example, cyclopentanone has been obtained in a 40% theoretical yield.

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