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1997 (1)
1996 (1)
1Author    G. Jochem, A. Schmidpeter, H. NöthRequires cookie*
 Title    Bis(triphenylphosphoniumyIidyl)phosphane Bis(triphenylphosphoniumylidyl)phosphanes  
 Abstract    Bis(ylidyl)phosphanes can be prepared from ylides and dichlorophosphanes or from bis-(ylidyl)phosphenium chlorides and organolithium compounds. By substituting in bis(ylidyl)-phosphenium chlorides the chloride ion for more basic anions, a large variety o f bis(ylidyl)-phosphanes is accessible. They can be protonated at the ylidic carbon atoms, but alkylated and oxidized at the central phosphorus atom. A s shown by 3IP NM R in solution and by X-ray investigation of the crystal, the lone pair at the tervalent phosphorus is generally oriented synperiplanar to both phosphonio groups. 
  Reference    Z. Naturforsch. 51b, 267—2 (1996); eingegangen am 10. Juli 1995 
  Published    1996 
  Keywords    Ylides, Transylidation, Phosphenium Ions, M ichaelis Arbusov Rearrangement, Diphosphanes 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0267.pdf 
 Identifier    ZNB-1996-51b-0267 
 Volume    51 
2Author    Hans-Peter Schrödel, Alfred SchmidpeterRequires cookie*
 Title    Phosphorandiyl-l,3,5-triphosphinane/ Phosphonio-l,3,5-triphosphinin Kationen Phosphoranediyl-l,3,5-triphosphinanes / Phosphonio-l,3,5-triphosphinine Cations  
 Abstract    Depending on the reaction conditions, the condensation of triphenylphosphonium bis(trimethylsilyl)methylide 1 with phosphorus trichloride and phosphorus tribromide gives the cyclic trimers (Ph3P=CP-X)3, X = Cl, Br, trihalo-tris(triphenylphosphoranediyl)-1,3,5-triphosphinanes 3 and 5. In solution the compounds dissociate to give the ionic forms 4 and 6 which rapidly exchange the halide between the halophosphine and the phosphenium moieties. The exchange is slowed down when the halide ion is replaced by a tosylate ion. Substitution of the covalent chloride of 4 for diphenylphosphino groups gives again an ionic product 10, while the introduction of a morpholino group as well as the replacement of all chloride by triflate give dicationic compounds 12 and 13. Reaction of 3 with gallium trichloride finally leads to the tris(triphenylphosphonio)-l,3,5-triphosphinine trication as a major equilibrium participant. 
  Reference    Z. Naturforsch. 52b, 162—168 (1997); eingegangen am 24. Oktober 1996 
  Published    1997 
  Keywords    Phosphonium Ylides, Halophosphines, Phosphenium Ions, 1, 3, 5-Triphosphinines, Halide Exchange 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0162.pdf 
 Identifier    ZNB-1997-52b-0162 
 Volume    52