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Phosphorus ylide substituents Ph3PCR (for example, R = Me, Ph) can stabilize a phosphorus(V) center with trigonal-planar coordination: dithioxo- 1 and diseleno-λ5-phosphanes 2 remain monomeric, and the chloride and bromide salts of the selenoxophosphonium ion 3 do not rearrange to the covalent phos-phinoyl halides. The central, positively charged phosphorus atom is electronically stabilized by the ylide substituent.
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Schmidpeter et al. (1992) studied this question.
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