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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 473-478 
    ISSN: 0009-2940
    Keywords: Tetraalkylcyclotetrastibanes ; Pentaalkylcyclopentastibanes ; Alkylantimony polymers ; Tetramesitylcyclotetrastibane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and Structures of Ethyl-, Propyl-, Butyl-, and MesitylantimonyDehalogenation of alkylantimony dibromides RSbBr2 (R = Et, Pr, Bu) with Mg in THF gives yellow solutions containing mainly five-membered antimony rings (RSb)5 and four-membered antimony rings (RSb)4. The trimers (RSb)3 are identified by mass spectrometry. Evaporation of the solutions reversibly gives black solids of the polymers (RSb)x (x » 5). The substituents R in the cycles preferentially adopt trans positions. The crystal structure of (MesSb)4·benzene contains linear …Sb4…Sb4…connected cyclotetrastibane-arene complexes with good η6-hapticity of the benzene molecule to one of the four Sb atoms (ring center…Sb 3.81 Å, angle to the perpendicular line 5°). The Sb4 ring is folded considerably.
    Notes: Die Enthalogenierung von Alkylantimondibromiden RSbBr2 (R = Et, Pr, Bu) mit Mg in THF führt zu gelben Lösungen, die überwiegend die Antimonfünfringe (RSb)5 neben den Vierringen (RSb)4 enthalten. Die Trimeren (RSb)3 können massenspektrometrisch nachgewiesen werden. Beim Entfernen des Lösungsmittels bilden sich reversibel die Polymeren (RSb)x (x » 5) in Form schwarzer Festkörper. In den Ringen nehmen die Substituenten R maximale trans-Positionen ein. Die Kristallstruktur von (MesSb)4 · Benzol enthält linear …Sb4…Sb4…-verknüpfte Cyclotetrastiban-Aren-Komplexe mit guter η6-Haptizität des Benzolmoleküls an eines der vier Sb-Atome (Ringmitte…Sb 3.81 Å, Winkel zur Flächennormale 5°). Der Sb4-Ring ist stark und uneinheitlich gefaltet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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