Oestrone methyl ether and 1-methyloestra-1,3,5(10)-trien-17-one were converted into their 18-nor derivatives in 7–8% overall yield, the conversion proceeding via their oximes.
M. M. Coombs and C. W. Vose, J. Chem. Soc., Chem. Commun., 1974, 602 DOI: 10.1039/C39740000602
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