| http://www.w3.org/ns/prov#value | - The 3,20-diketopregnenes of formula II can be prepared by reacting an 11??-hydroxy-3,20-diketopregnene with a benzaldehyde dialkyl acetal having the formula ##SPC4## The reaction can be run in an aprotic solvent, e.g., a hydrocarbon such as benzene or toluene.
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