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1981 (1)
1980 (1)
1Author    Rolf Gleiter, Richard BartetzkoRequires cookie*
 Title    The Structures of S4N e , S3N202 and S4N3 e  
 Abstract    Part of the potential surface of S4N e has been investigated using the MNDO method. It is found that the cis-trans isomer lb is more stable by 20-30 kJ/mol than the trans-trans isomer (1 c) and the cis-cis isomer (1 a). The stability of 1 b is traced back to stabilization of the HOMO and to a Coulomb attraction. For S3N2O2 (2) the MNDO calculations favour those isomers (2a and 2b) with two sickle-like arrangements for the same reasons. For S4N3 e (3) only one isomer (3a) is favoured due to the stabilization of the HOMO. The similarity in the transannular interaction present in 1-3 and that in trithiapentalenes and related compounds is pointed out. The PE spectrum of 2 has been reinvestigated. The first five bands can be interpreted by comparison between the measured ionization potentials and the calculated (MNDO) orbital energies. 
  Reference    Z. Naturforsch. 36b, 492—497 (1981); received December 22 1980 
  Published    1981 
  Keywords    Structural Isomers, MNDO Calculations, Transannular Interactions 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0492.pdf 
 Identifier    ZNB-1981-36b-0492 
 Volume    36 
2Author    Uwe Klingebiel, Jutta NeemannRequires cookie*
 Title    .3-Silylgruppenwanderung und gehinderte Si-N-Bindungsrotation Aminofluorosilanes: 1,3-Migration of Silyl Groups and Si-N-Rotational Barrier  
 Abstract    with bulky amino groups are prepared by the reaction of bis-(organyl-trimethylsilyl)amino-difluorosilane8 with lithiated amines. A 1,3-migration of trimethylsilyl groups from bulky alkylamino substituents to arylamino substituents is observed in these reactions. Structural isomers of the new triaminofluorosilanes were isolated. The silyl group migration depends on steric and electronic effects. Further reactions of the triaminofluorosilanes with butyllithium and trifluoroorganylsilanes lead to the formation of difluorosilyl-substituted triaminofluorosilanes and LiF. The symmetric compounds show AB-systems for the fluorine atoms of the difluorosilyl groups in the low temperature 19 F NMR Spectra, due to hindered rotation about the Si-N-bond. The coalescence temperature depends on the bulkiness of the substituents and is observed at or about room temperature. 
  Reference    Z. Naturforsch. 35b, 1155—1161 (1980); eingegangen am 24. Januar/13. März 1980 
  Published    1980 
  Keywords    Aminofluorosilanes, Structural Isomers, Silyl Group Migration, Rotational Barrier, NMR Spectra Triaminofluorosilanes 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1155.pdf 
 Identifier    ZNB-1980-35b-1155 
 Volume    35