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Abstract
Ylids containing two fluorine atoms at the phosphorus atom of the P[dbnd]C group were prepared by reaction of trifluorophosphoranes with sterically hindered amides of lithium. The ylid structure was studied by means of NMR spectra and chemical reactions. The ylids add to the multiple P[dbnd]C bond alcohols, phenol, thiophenol, HN3 to form difluorophosphoranes, react with carbonyl compounds by a [2 + 2]-cycloaddition to give four membered phosphorus heterocycles, 2,2-difluoro-1,2Δ5-oxaphosphetanes.