Methods for Total Synthesis of Steroids. XVIII. 1 Δ 14 -16-Keto Steroid Approach to Ring D. H. 2 Introduction of 17-Carboxy Group. Synthesis of 14α,17β and 14β,17α Isomers of rac-Estra-5(10),6,8-triene-17-carboxylic Acid

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