Conjugated Additions in Hydrogen Fluoride

Fluorine and another substituent can be added in a single step to compounds having CC double bonds in anhydrous hydrogen fluoride. It is possible in this way to obtain e.g. α‐fluorinated β‐halogeno, β‐alkyl, β‐nitro, and β‐amino compounds, and also (in some cases by secondary reactions) fluorinated ethers, alcohols, esters, and carboxylic acids, β‐fluoro alcohols can be obtained by conjugated “hypofluorination” in the presence of oxenium ions.