Reaction of Δ4-3-keto-steroids with lithium hexamethyldisilazane yields 2,4-dienolate ions which can be methylated at C-2 or trapped as 2,4-dienolsilyl ethers.
M. Tanabe and D. F. Crowe, J. Chem. Soc., Chem. Commun., 1973, 564 DOI: 10.1039/C39730000564
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