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1Author    Hubert Schmidbaur, Thomas CostaRequires cookie*
 Title    Synthese eines Doppel-Carbodiphosphorans und seiner Vorstufen Synthesis of a Double-Carbodiphosphorane and its Precursors  
 Abstract    The reaction of 1,4-dibromobutane with bis(diphenylphospliino)methane (1) yields two products, one of which is identified as butane-l,4-bis[diphenyl(diphenylphosphinomethyl)-phosphonium bromide] (3 a). Transylidation of this bis-phosphonium salt using two equiv-alents of (CH3)3P = CH2 affords the bis-ylide [CH2CH2P(C6H5)2 = CH-P(C6H5)2]2 (4) in high yields. This conversion can be reversed on treatment of 4 with etheral HCl (to give 3b). Methylation of 4 with CH3I occurs at phosphorus, however, and produces the bis-semiylide salt (5), [CH2CH2P(C6H5)2CHP(C6H5)2CH3]2 2e 2Iö. Transylidation of 5 (again with (CH3)3P = CH2) leads to the bis-carbodiphosphorane (6), [CH2CH2P(C6H5)2 = C = P(C6H5)2CH3]2. All compounds were characterized by elemental and detailed NMR analyses. The second product of the above quaternisation reaction is a cyclic bis-phosphonium salt (2) with a seven-membered ring structure. 
  Reference    Z. Naturforsch. 37b, 677—79 (1982); eingegangen am 9. Februar 1982 
  Published    1982 
  Keywords    1, 4-Dibromobutane, Transylidation, Carbodiphosphorane, Bis-carbodiphosphorane, Ylides 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0677.pdf 
 Identifier    ZNB-1982-37b-0677 
 Volume    37 
2Author    Lothar WeberRequires cookie*
 Title    Übergangsmetall-Schwefelylid-Komplexe, XXII [1] Zur Reaktivität von DicarbonylnitrosyI-f/ 5 -thiacyclohexadienyl-l-oxid- Chromkomplexen gegenüber Phosphor-und Schwefelyliden Transition Metal Sulfur Ylide Complexes, XXII [1] Reactivity Studies of Dicarbonylnitrosyl-^-thiacyclohexadienyl-l-oxide Chromium Complexes with Phosphorus and Sulfur Ylides  
 Abstract    ?? 5 -Thiacyclohexadienyl-l-oxide chromium complexes 3a—d are generated by treatment of the 1-methyl-thiabenzene-l-oxide complexes la—d with Li[BHEt 3 ] and successive nitrosylation of the intermediates 2a—d. 3a—d react with Me 2 S(0) = CH 2 or Ph 3 P=CH 2 at a carbonyl ligand in an additon/transylidation process to yield the very sensitive products 5, 6a—d. 
  Reference    Z. Naturforsch. 40b, 373—379 (1985); eingegangen am 12. Oktober 1984 
  Published    1985 
  Keywords    Reactivity, ?; 5 -Thiacyclohexadienyl-l-oxide Complexes, Sulfur Ylides, Transylidation 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0373.pdf 
 Identifier    ZNB-1985-40b-0373 
 Volume    40 
3Author    FouadM. Soliman, M. Edhat, M. SaidRequires cookie*
 Title    Chemistry of Phosphorus Ylides, 11 [1] Reactions with Phosphacumulenes, V: The Reaction of Phosphoranes with Hydroxyxanthenone and Hydroxyquinoline Mannich Bases. Novel Synthesis for Pyranones, Pyranthiones, Phosphoranylidenes  
 Abstract    The reaction o f 1-hydroxyxanthenone (1) and hydroxyquinoline (10, 13) Mannich bases with the reactive phosphacumulated ylides (2), represents a new way for the synthesis o f the pyranones and pyranthiones (5, 11, 14). On the other hand, the stabilized phosphorus ylides (6) affect the transylidation o f the Mannich base (1) to the corresponding phosphoranylidenes (9). The structure o f the resulting new com pounds has been confirmed through elemental anal­ ysis and spectroscopic results (IR, 'H, 3IP N M R and MS). 
  Reference    Z. Naturforsch. 46b, 1105—1109 (1991); received Dezember 17 1990 
  Published    1991 
  Keywords    Wittig Reagents, Pyranones, Pyranthiones, Transylidation, Phosphoranylidenes 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1105.pdf 
 Identifier    ZNB-1991-46b-1105 
 Volume    46 
4Author    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