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1984[X]
1Author    Susanna Kerschl, Bernd WrackmeyerRequires cookie*
 Title    Organoborierung von Alkinylstannanen, XIV [1]  
 Abstract    Organoborierung von Bis(alkinyl)stannanen: Mechanismus und Anwendung der 119Sn—NMR-Spektroskopie O rganoboration of Alkynylstannanes, XIV [1] O rganoboration of Bis(alkynyl)stannanes: M echanism and Application of 119Sn NM R Spectroscopy Dimethylbis(phenylethynyl)stannane (1) reacts with trialkylboranes, BR3 (2), to give bis(al-kenyl stannanes (5) (R = C2H5), l-bora-4-stanna-2,5-cyclohexadienes (6) (R = C2H5, C3H7'), 1-stanna-2,4-cyclopentadienes (7) (R = C2H5) and l-stanna-3-cyclopentenes (8) (R = CH3, C2H5). I3C and uySn NMR data prove the structure of the reaction products (5 to 8). 119Sn NMR is useful (i) for following the course of the reaction (mechanism!) and (ii) for quantitative analysis of the product distribution. Deorganoboration reactions play an important role in the formation of the various heterocyclic systems. 
  Reference    Z. Naturforsch. 39b, 1037—1041 (1984); eingegangen am 24. Februar 1984 
  Published    1984 
  Keywords    et Alkynylstannanes, Organoboration, Mechanism, 1, ySn NMR Spectra, 13C NMR Spectra 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-1037.pdf 
 Identifier    ZNB-1984-39b-1037 
 Volume    39 
2Author    Alfred Gieren, Viktor Lamm, RobertC H Addon, M. Artin, L. Kaplan, M.John Perkins, Peter FlowerdayRequires cookie*
 Title    Vergleichende Röntgenstrukturanalysen von Naphthothiadiazinen und isovalenzelektronischen Naphthotriazinen-I-nstitut für B iochem ie, A bt. Strukturforschung I, D-8033 Martinsried  
 Abstract    Röntgenstrukturanalysen von Acenaphthyleno[5,6-cd][l,2,6]-thiadiazin, 2-Methyl-2 H-acenaphthyleno[5,6-de]-l,2,3-triazin und Naphtho[l,8-de]thiadiazin Comparison of Naphthothiadiazines and Isoelectronic Naphthotriazines by X-Ray Structural Analysis X-Ray Structural Analyses of A cenaphthyleno[5,6-cd][l,2,6]thiadiazine, 2-M ethyl-2H -acenaphthyleno[5,6-de]-l,2,3-triazine and N ap h th o [l,8-de]thiadiazine We have performed an X-ray structural analysis of the sulphur diimide 1 and the isoelectronic triazine 2. In addition we found two crystal m odifications o f the sulphur diimide 3, which is an analogue o f the previously characterized 4, but the m odification suitable for X-ray analysis (tetra­ gonal, ß) was disordered. From the bond lengths o f 1 and 2 results, that in both cases there is only 
  Reference    Z. Naturforsch. 39b, 975 (1984); eingegangen am 27. D ezem ber 1983 
  Published    1984 
  Keywords    Sulphur D iim ides, 1, 2, 3-Triazines, X -R ay, Bonding Relationships 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0975.pdf 
 Identifier    ZNB-1984-39b-0975 
 Volume    39