A method based on the differences among the 1H NMR chemical shifts of geminal protons of ring‐F methylene resonances (H2‐23, H2‐24 and H2‐26) is proposed for ascertaining the 25R/25S stereochemistry of ring‐F unsubstituted spirostane‐type steroidal sapogenins and steroidal saponins.
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Pawan K. Agrawal (2003) studied this question.
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