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Reductive condensation of Ph 3 P=C(SiMe 3 ) 2  and PCl 3  or PBr 3  yields the ionic halides of the 3,5-bis(triphenylphosphonio)-1,2,4-triphospholide cation 5. The compounds can take up two moles of halogen X 2 . In the first step bis(triphenylphosphoranediyl)trihalo-1,2,4-triphos- pholanes 6 are formed. Low temperature  31 P NMR spectroscopy shows them to exist in two conformeric forms. In polar solvents heterolytic dissociation of the phosphorus-halogen bond in the 4-position occurs.

zeitschrift für naturforschung b

Halogenierungs- und Dissoziationsstufen eines Diphosphonio-1,2,4- triphosphoiids / Stages of Halogenation and Dissociation of a Diphosphonio-1,2,4-triphospholide