The Polyphosphoric Acid-Catalyzed Ring Opening of 4,5-Epoxy-3-oxo Steroids. IV. The Synthesis of 17α-Hydroxy-4-ethylthiopregn-4-ene-3,20-dione and Its Analogs

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1-Methyl-5,6,7,8-tetrahydronaphthaleneの合成とニトロ化について

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