The polyphosphoric acid-catalyzed ring opening of 4,5-epoxy-3-oxo steroids: the synthesis of 4-alkylthio-4-en-3-oxo steroids and their analogs.

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@article{Tomoeda1964ThePA, title={The polyphosphoric acid-catalyzed ring opening of 4,5-epoxy-3-oxo steroids: the synthesis of 4-alkylthio-4-en-3-oxo steroids and their analogs.}, author={M Tomoeda and Masaya Ishizaki and Hiroko Kobayashi and S Kanatomo and Tetsuya Koga}, journal={Chemical & pharmaceutical bulletin}, year={1964}, volume={12 3}, pages={383-5} }