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1997[X]
1Author    T. Deforth, M. Kaschke, H. Stock, H. Pritzkow, W. SiebertRequires cookie*
 Title    Synthesis of C2B3 X-Heterocycles (X = C, N, P, O, S) from l,3?5-Triborapentanes  
 Abstract    The hydroboration of acetylene with HBCb yields the products (CbB^CHM e (la), (Cl2BCHMe)2BCl (2a), (Cl2BCHMeBCl)2CHMe (3a), and (ClBCHMe)3 (4a). The crystal structure of 4a as well as of the pentaiodo derivative 2b were determined. A mechanism for the formation of the different hydroboration products is proposed. The 1,3,5-triborapentane 2a serves as precursor for the synthesis of derivatives of 1,3,5-triboracyclohexanes, 1,3,5-tribora-2-aza-cyclohexanes, l,3,5-tribora-2-phospha-cyclo-hexanes, and 1,3,5-tribora-2-thia-cyclohexanes. Their constitutions have been derived from spectroscopic studies. The crystal structure of the 1,3,5-tribora-2-oxa-cyclohexane derivative was also determined. 
  Reference    Z. Naturforsch. 52b, 823—830 (1997); received March 4 1997 
  Published    1997 
  Keywords    Hydroboration, 1, 3, 5-Triborapentanes, 1, 3, 5-Triboracyclohexanes, l, 3, 5-Tribora-2-oxa-cyclo-hexanes, 1, 3, 5-Tribora-2-aza-cyclohexanes 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0823.pdf 
 Identifier    ZNB-1997-52b-0823 
 Volume    52 
2Author    Thomas Dezember, Helmut SitzmannRequires cookie*
 Title    Die Fulven-Route zum Pentaisopropylcyclopentadienid The Fulvene Route to Pentaisopropylcyclopentadienide  
  Reference    Z. Naturforsch. 52b, 911—918 (1997); eingegangen am 21. April 1997 
  Published    1997 
  Keywords    1, 2, 3, 4-Tetraisopropyl-6-dimethylamino-pentafulvene, 1, 2, 3, 4-Tetraisopropyl-6-methyl-pen-tafulvene, 1, 2, 3, 4-Tetraisopropylpentafulvene, Lithium Pentaisopropylcyclopentadienide, Ful­ vene Complexes 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0911.pdf 
 Identifier    ZNB-1997-52b-0911 
 Volume    52 
3Author    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