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Treatment of 3β-hydroxyl-5-Δ steroids with anhydrous FeCl 3 in CH 2 Cl 2 afforded reasonable yields of the corresponding alkyl chlorides with a retention of configurations. The structures of the chlorine-exchanging products were determined by NMR and HRMS spectra. The absolute configurations were confirmed by X-ray crystal analysis of 3β-chloro-androst-5-en-17-one. The generality...
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