A Addition of hydrogen fluoride

Addition to acetylenes occurs under a variety of conditions the reaction of acetylene with hydrogen fluoride is important for the manufacture of vinyl fluoride, although the 

Hydrofluorination of corresponding C=N bonds of isocyanates and diazoketones gives carbamyl fluorides and a-fluoroketones repectively [43]. 

Russian workers subsequently reported controlled addition to vinyl acetate [257] and fumaric acid [258], to give difluoroethyl acetate and monofluoroacetaldehyde, respectively. Selective fluorination of many alkanes [8, 259], such as acenaphthene [260], 

1-diphenylethene [261] and many steroids [236], is now possible in sometimes surprisingly high yield by passing fluorine diluted with an inert gas through a solution of the unsaturated compound (Table 3.9). 

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