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1981 (2)
1Author    Martin DrägerRequires cookie*
 Title    5-Chlor-5-phenyl-l-oxa-4.6-dithia-5-stannocan, ein diplanarer Übergangszustand bei der Racemisierung der Wanne-Sessel- Konformation in einem 8-Ring [1] 5-Chloro-5-phenyl-l-oxa-4,6-dithia-5-stannocane, a Diplanar Transition State for the Racemisation of the Boat-Chair Conformation in an Eight-Membered Ring [1]  
 Abstract    The title compound has been synthesized from PhSnCl3 and the disodium salt of bis(2-mercaptoethyl)ether. The crystal structure has been determined and refined to R — 0.033. The conformation of the eight-membered heterocycle is slightly disordered and represents a diplanar form, which is generally considered the transition state near the saddle point of the energy surface between the two enantiomers of the boat-chair con-formation. The configuration around tin is a trigonal bipyramid with equatorial sulfur atoms, an equatorial phenyl group and with axial atoms CI and O (transannular distance Sn--0 241 pm). 
  Reference    Z. Naturforsch. 36b, 437—440 (1981); eingegangen am 4. Februar 1980 
  Published    1981 
  Keywords    Tin, Heterocycles, Conformation, Transition State 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0437.pdf 
 Identifier    ZNB-1981-36b-0437 
 Volume    36 
2Author    Gernot Frenking, Helmut SchwarzRequires cookie*
 Title    Frontorbitale und 1.2-Hydridwanderungen in Carbeniumionen Frontier Orbitals and 1,2-Hydrogen Shifts in Carbenium Ions  
 Abstract    For various carbenium ions it is shown that the energy value and the degree of localiza-tion of the LUMO have a significant influence on the energy barriers of 1,2-hydrogen shifts. The structures of the transition states are in line with the Hammond-Postulate. 
  Reference    Z. Naturforsch. 36b, 797—801 (1981); eingegangen am 10. März 1981 
  Published    1981 
  Keywords    Carbocation Chemistry, 1, 2-Hydrogen Migration, Frontier Orbitals, Quantum Mechanical Calculations, Transition States 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0797.pdf 
 Identifier    ZNB-1981-36b-0797 
 Volume    36