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1993 (1)
1988 (1)
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1Author    Lothar Steiling, Ulrich WannagatRequires cookie*
 Title    Sila-Pharmaka, 15. Mitt. [1] Synthese und Eigenschaften des Sila-Pridinols Sila-Drugs, 15th Communication [1] Synthesis and Properties of Sila-Pridinol  
 Abstract    Synthesis of the silicon analogue VI b of the drug pridinol and of its homologue VI a was achieved via eq. (l-5b) (Scheme 1). The novel compounds IVa-VIb are described in their properties and confirmed in their structures (Tables I-IV). Some preliminary pharma-cological investigations suggest spasmolytical effects of sila-pridinol seeming to be somewhat better than those of pridinol itself. 
  Reference    Z. Naturforsch. 34b, 1413—1417 (1979); eingegangen am 25. Mai 1979 
  Published    1979 
  Keywords    Organosilicon Compounds, Syntheses, Chemical and Pharmacological Properties 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1413.pdf 
 Identifier    ZNB-1979-34b-1413 
 Volume    34 
2Author    Alexander Lichtblau, Hans-Dieter Hausen, Wolfgang KaimRequires cookie*
 Title    First Structural Characterization of an Easily Oxidized Derivative o f 1,4-Dihydroquinoxaline  
 Abstract    The first crystal structure analysis o f a 1,4-dihydroquinoxaline is described by example o f the l,4-bis(re/-/-butyldimethylsilyl) derivative. In the solid state, this molecule exhibits a non-planar heterocycle with a dihedral angle o f 156.3° along the N -N axis in the boat-shaped 87r electron ring system. The alkyl groups o f the Si(/er/-Bu)M e2 substituents are arranged as to minimize steric repulsion. Despite the reduced n electron conjugation due to non-planarity, the com pound is oxidized reversibly to an EPR detectable radical cation at -0 .5 9 V vs. ferro­ cene in dichloromethane. However, the second oxidation to the fully aromatic dication is elec-trochemically irreversible. A comparison with previously obtained results illustrates the struc­ tural flexibility o f the non-aromatic 1,4-dihydro-1,4-diazine ring system which is strongly affected by rather weak non-bonded interactions. 
  Reference    Z. Naturforsch. 48b, 713 (1993); eingegangen am 21. Dezember 1992 
  Published    1993 
  Keywords    Heterocycles, Organosilicon Compounds, Crystal Structure, Cyclic Voltammetry, Conformation 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0713.pdf 
 Identifier    ZNB-1993-48b-0713 
 Volume    48 
3Author    Olefine, Hans-Dieter Hausen, Christian Bessenbacher, Wolfgang KaimRequires cookie*
 Title    Elektronenreiche  
 Abstract    Struktur und Elektrontransfer-Reaktivität des cyclisch <7/7r-hyperkonjugierten Carbosilans 3,3,6,6-Tetrakis(trimethylsilyl)-l,4-cyclohexadien Electron Rich Olefins, 2 Structure and Electron Transfer Reactivity of the Cyclically a/jr-Hyperconjugated Carbosilane 3,3,6,6-Tetrakis(trimethylsilyl)-l,4-cyclohexadiene Crystal and molecular structure analysis of the title compound 1, a most electron rich carbosi-lane, exhibits a shallow boat conformation for the cyclohexadiene ring which is shielded by four bulky Me 3 Si groups. Multiple hyperconjugative interaction occurs between the two non-conju-gated olefinic JZ systems and the four rather long (192 pm) carbon-silicon o bonds which form an angle of about 34° with the assumed JZ axis. The HOMO destabilization caused by this unique structural arrangement explains the energetically facile formation and subsequent reactivity of the cation radical 1 + which was found to undergo oxidative desilylation to the aromatic l,4-bis(tri-methylsilyl)benzene precursor in the single electron transfer reaction with TCNE. 
  Reference    Z. Naturforsch. 43b, 1087—1093 (1988); eingegangen am 11. Mai 1988 
  Published    1988 
  Keywords    Organosilicon Compounds, Molecular Conformation, Electron Transfer, Hyperconjugation, Electronic Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1087.pdf 
 Identifier    ZNB-1988-43b-1087 
 Volume    43