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Abstract:
The three most readily accessible D-homo isomers of 17-acetoxy-6-methylpregna-4,6-diene-3,20-dione (Ib) have been prepared and characterized in detail. The 17-keto isomers IIb and IIIb were obtained by base-catalyzed rearrangement of Ia followed by reacetylation, and the 17a-ketone IVb by Lewis-Acid treatment of Ia.