Conjugate addition of Me₃SiMe₂SiLi to cycloalk-2-en-1-ones, ketalization, Tamao–Fleming oxidation (Bu₄NF, then H₂O₂, KHCO₃), TPAP oxidation and acid hydrolysis generates 2-methyl cycloalkane-1,3-diones. Ketalization is needed in order to prevent addition of Me₃Si⁻ to the carbonyl. The pentamethyldisilanyl group has advantages over other silicon units that are used in Tamao–Fleming procedures.