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1Author    R.S T, N. K., P.S KRequires cookie*
 Title    Studies on Ylides: Carbonyl Olefination with Diphenylmethylene- triphenylphosphorane  
 Abstract    Diphenylmethylenetriphenylphosphorane, a stable phosphonium ylide, has been prepared and reacted with a range of substituted aromatic aldehyde to afford 1,1,2-tri­ aryl-substituted ethylenes in fair to good yields. The structure of the products are based on IR and NM R spectral evidence. 
  Reference    (Z. Naturforsch. 30b, 513—515 [1975]; received February 26 1975) 
  Published    1975 
  Keywords    Ylides, Carbonyl Olefination, Phosphorane, Diphenylmethylenetriphenylphosphorane 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0513.pdf 
 Identifier    ZNB-1975-30b-0513 
 Volume    30 
2Author    Hubert Schmidbaur, Peter HollRequires cookie*
 Title    Die Reaktion eines gemischten Doppelylids mit Ethylenoxid Reaction of a Mixed Double Ylide with Ethylene Oxide  
 Abstract    Dimethyl-trimethylphosphinimino-methylene-phosphorane, (CH3)3P=N-P(CH3)2 = CH2 was found to react with ethylene oxide to form a 1:1 adduct, that was identified as 2,2-dimethyl-2-trimethylphosphinimino -1,2 A 5 -oxaphospholane. According to its 1 H, 13 C, 31 P NMR spectra it is assigned a rigid trigonal bipyramidal structure with nitrogen and oxygen atoms in axial positions. 
  Reference    Z. Naturforsch. 33b, 572—573 (1978); eingegangen am 28. Februar 1978 
  Published    1978 
  Keywords    Ylides, Ethylenoxide, 1, 2-Oxaphospholane 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0572_n.pdf 
 Identifier    ZNB-1978-33b-0572_n 
 Volume    33 
3Author    R. S. Tewari, S. K. Suri, K. C. GuptaRequires cookie*
 Title    Studies on Thiocarbonyl Olefination Reactions with Phosphonium Ylides  
 Abstract    Reactions of several semi-stabilized phosphonium ylides with 2,7-dibromofluorenethione and thiobenzophenone, have been reported to give substituted 9-benzylidene-2,7-dibromo-fluorenes and 1-(substituted phenvl)-2,2-diphenyl ethylenes respectively in fair to good yields. The structural identities were based on spectral data. 
  Reference    Z. Naturforsch. 34b, 606—608 (1979); received November 2 1978 
  Published    1979 
  Keywords    Ylides, Phosphonium Ylides, Thioketones, Olefins 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0606.pdf 
 Identifier    ZNB-1979-34b-0606 
 Volume    34 
4Author    H. Schmidbaur, A. MörtlRequires cookie*
 Title    Ein spiro-bicyclisehes Phosphor-ylid und sein korrespondierendes Phosphoniumkation A Spiro-bicyclic Phosphorus Yhde and its Corresponding Phosphonium Cation  
  Reference    Z. Naturforsch. 35b, 990—993 (1980); eingegangen am 19. Mai 1980 
  Published    1980 
  Keywords    Ylides, Phosphorus Ylides, Phosphonium Salts, Spiro-bicyclic Compounds 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0990.pdf 
 Identifier    ZNB-1980-35b-0990 
 Volume    35 
5Author    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 
6Author    Hubert Schmidbaur, Ulrich Deschler, Dietmar SeyferthRequires cookie*
 Title    Ylide Complexes of Alkali and Earth Alkaline Metals, VI [1] Neutral and Anionic Ferrocenylmethylides and Fluorenylides  
 Abstract    Coordination properties of phosphorus ylides towards electropositive metals are greatly improved in systems, where the carbanionic charge can be delocalized into the aromatic rings of substituents, as illustrated in the title compounds. The ferrocenyl-substituted ylide 2, synthesized from bis(diphenylphosphino)methane and (ferrocenyl)trimethyl-ammonium iodide via the phosphonium salt intermediate 1, is thus easily converted into the alkali complexes 3 a, b on treatment with NaNH2 or KH in tetrahydrofuran, respec-tively. The intensely coloured products are soluble in a number of organic solvents. NMR spectra of these solutions provide evidence for an interaction between alkali cations and the ferrocenyl rings. -From (C6H5)2CH2P(C6H5)2 and ferrocenylmethyl chloride a di-quaternary salt 4 is obtained, which yields a double-ylide mixture 5 a, b on treatment with base. Hydrolysis of tIiis product affords the ylidic phosphine oxide 6. -The reaction of the ylides 7 and 9 (described previously) with NaNHo, KH or barium metal (in liquid ammonia) leads to the (earth) alkali complexes 8a-c and 10a, b, respectively. With the exception of 8c, but similar to 3a, these materials contain tetrahydrofuran solvate molecules. The 23 Na NMR spectrum of 8a and the pronounced quadrupole broadening of the P(III) signals by the alkali cations in the 31 P NMR spectra of 8 a, b allow structural suggestions for the solution state as proposed in the formulae. Further treatment of 10b with KH yields a potassium complex 11, characterized, i.a.. via a corresponding diquaternary 
  Reference    Z. Naturforsch. 37b, 950—956 (1982); eingegangen am 2. März 1982 
  Published    1982 
  Keywords    Ylides, Alkali Complexes, Phosphonium Salts, Phosphonium Ferrocenylmethylides 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0950.pdf 
 Identifier    ZNB-1982-37b-0950 
 Volume    37 
7Author    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