2000 organo-phosphorus compounds, acyclic C derivatives

organo-phosphorus compounds, acyclic C derivativesS 0082

02 - 187An Unusual Reaction of Hexafluoroacetone with Methylenediphos-phanes: Facile Synthesis of Carbodiphosphoranes. — Reaction ofhexafluoroacetone (II) with methylenediphosphorane (I) does not afford theexpected dioxaphospholane heterocycle but provides a carbodiphosphorane(III), whose structure is elucidated by NMR techniques. Compound (III)smoothly adds HCl or Cl2 to the ylidic bond to give the correspondingphosphonium salts (IV) and (VI), respectively. The addition of HF to car-bodiphosphorane (III) is subsequently followed by substitution reaction andaffords bis(difluorophosphorane) (V). Finally, the synthesis of a phosphonium-substituted carbene (VIII) is achieved by silver-promoted dechlorination ofthe phosphonium chloride (VII). — (SHEVCHENKO, IGOR; MIKOLENKO,ROSTISLAV; LOSS, SANDRA; GRUETZMACHER, HANSJOERG; Eur. J.Inorg. Chem. (1999) 10, 1665-1671; Lab. Anorg. Chem., ETH, CH-8092Zuerich, Switz.; EN)

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