The betaines formed by attack of the tervalent phosphorus compounds R2PX (X = NCO, NCS, or CH:CH2) on the oxygen atom of hexafluoroacetone (HFA) cyclise to give ylides which react further with HFA to give bicyclic phosphoranes. A 1,3,2-oxazaphosphetan is formed from the phosphoramidite (PhO)2P·NHPh and HFA.
E. Duff, S. Trippett and P. J. Whittle, J. Chem. Soc., Perkin Trans. 1, 1973, 972 DOI: 10.1039/P19730000972
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