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1981[X]
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 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0437.pdf 
 Identifier    ZNB-1981-36b-0437 
 Volume    36 
2Author    Axel Blecher, Martin Dräger, Bernd MathiaschRequires cookie*
 Title    (MeSn)4Se6, Geometrie und Schwingungsformen eines Adamantan-Gerüstes aus Zinn-Selen-Bindungen (MeSn)4Se6, Geometry and Vibrational Modes of an Adamantane Framework Formed by Tin-Selenium Bonds  
 Abstract    The title compound has been synthesized by reaction of MeSnBra and NaHSe in aqueous solution. The X-ray structure determination showed adamantane-like molecules (Sn-Se 253(1), Sn-C 215(1) pm) arranged in a quasi hexagonal-close packing. The atomic coordinates were used for an analysis of the vibrational spectra, yielding information on the distribution of the potential energy for the normal modes in terms of internal co-ordinates and a set of force constants. The valence force constants f(Sn-Se) 154(6), f(Sn-C) 216(2) N/m) are compared with those in related monocyclic molecules. 
  Reference    Z. Naturforsch. 36b, 1361—1367 (1981); eingegangen am 7. Mai 1981 
  Published    1981 
  Keywords    Tin, Selenium, Cage, Molecular Vibrations 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1361.pdf 
 Identifier    ZNB-1981-36b-1361 
 Volume    36