貧金屬
Metal enolates are compatible with many fluorinating reagents, including NFSI, NFOBS, and sulfonamides. However, the specialized reagent 2-fluoro-3,3-dimethyl-2,3-dihydrobenzo["d"]isothiazole 1,1-dioxide consistently affords better yields of monofluorinated carbonyl compounds in reactions with lithium enolates. Other metal enolates afforded large amounts of difluorinated products.