Esterification of acid chlorides with thallium and potassium salts of 19-norethisterone: formation of 17-enol esters 

 -  Steroids, 40(3), p.261-266, 1982 .
<br/><br/> During the esterification of acid chlorideswith thallium and potassium salts of 19-norethisterone, 17-en01 esters were isolated. The en.01 esters are formed via the intermediate, 4-estrene-3 ,I 7-dione