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  • 1
    Electronic Resource
    Electronic Resource
    1,2-Bis[trifluorosulfur(IV)]tetrafluoroethane F3S-CF2-CF2-SF3: A Bifunctional Molecule with Two Fluoroamphoteric Sulfur Centers⋆ (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1035-1039 
    Details
    ISSN: 1434-1948
    Keywords: α,ω-Bis(trifluorosulfur)perfluoroalkanes ; α,ω-Bis(fluorosulfinyl)alkanes ; Fluorosulfur anions ; Fluorosulfur cations ; Ab initio calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The title compound (-CF2-SF3)2 (2) is prepared from (-CF2-SCl)2 (1) and F2 at -90 °C in 83 % yield. Reaction of 2 with CsF and TASF yields Cs[(-CF2-SF3)2F] (8), TAS [(-CF2SF3)2F] (9) and (TAS)2[(-CF2-SF4)2] (10). Fluoride-ion abstraction yields [(-CF2SF2)2F] [AsF6] (6), BF3-catalysed solvolysis in SO2 gives [-CF2-S(O)F]2 (4), and CsF-catalysed oxidation with F2 leads to the previously reported (-CF2-SF5)2 (11). Ab initio calculations of the molecular structures of 2 and the related methane derivative F2C(SF3)2 are reported.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    What Governs the Stereochemistry of the SN2′ Reaction? (1996)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1996 (1996), S. 1593-1597 
    Details
    ISSN: 0947-3440
    Keywords: SN2′ reaction ; Stereochemistry ; Calculations, ab initio ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ab initio calculations of negatively charged symmetrical and unsymmetrical transition states of the SN2′ reaction indicate that due to electronic reasons and particularly Coulomb interactions the anti transition state is generally more stable than the syn transition state. The experimentally often observed syn preference results mainly from the interaction with a polar solvent and/or the gegenion, which gives rise to higher stabilization of the syn transition state than of the anti transition state.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199619961015
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    Paper (German National Licenses)
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