Medrogestone, prepared in accordance with this invention, does contain an identifiable amount of 6 methylene 17α methylpregn 4 ene 3,20 dione which is readily removed by reaction of the impurity with maleic anhydride to produce {HEAD ~ the Diels Alder adduct} which can then be hydrolyzed in {TAIL ~ the presence} of a base to afford the dibasic acid salt that is easily removed from the desired product by aqueous extraction 
Medrogestone , prepared in accordance with this invention , does contain an identifiable amount of 6 methylene 17α methylpregn 4 ene 3,20 dione which is readily removed by reaction of the impurity with maleic anhydride to produce { HEAD ~ the Diels Alder adduct } which can then be hydrolyzed in { TAIL ~ the presence } of a base to afford the dibasic acid salt that is easily removed from the desired product by aqueous extraction
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