A new method for replacement of hydroxyl by chlorine or bromine: preparation of 11β-halogeno-steroids

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Abstract
11α-Hydroxy-19-nor-steroids react with N-(2-chloro-1,1,2-trifluoroethyl)diethylamine to give the 11β-fluoro-derivatives or, in presence of lithium chloride or lithium bromide, the 11β-chloro- and 11β-bromo-derivatives, respectively.