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Fremgangsmåde til fremstilling af 21-hemitetrahydrophthalater af 3,20-dioxo-21-hydroxy-pregnanforbindelser eller alkalimetal-, jordalkalimetal-, ammonium- eller aminsalte deraf.
Fremgangsmåde til fremstilling af β,β-pentamethylenbutyrolacton eller alkalimetal-, jordalkalimetal-, ammonium- eller organiske aminsalte af 3,3-pentamethylen-4-hydroxysmørsyre.
Fremgangsmåde til fremstilling af basisk substituerede xanthenoler, thioxanthenoler eller dibenzocycloheptadienoler eller syreadditionssalte eller kvaternære ammoniumforbindelser deraf.