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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The First Reversible Thermal Dissociation of Distannanes, R3Sn-SnR3, Giving Stannyl Radicals, R3Sn.Thermal and reversible dissociation of organic distannanes, R3Sn-SnR3 (1) ⇄ 2 R3Sn. (2), have been found for the first time when a sufficient strain in 1 was generated by bulky substituents. For this, the residues R = phenyl, cyclohexyl, 1-adamantyl are not sufficient up to 230°C, but with R = 2,4,6-trialkylphenyl the dissociation temperature (ESR) is lowered to 20°C in the series alkyl = Me, Et, iPr. The ESR spectra of stannyl radicals 2 as well as vSn-Sn(sym.) [Raman], δHDiss., and EA values for 1 are reported. New distannanes 1 and corresponding compounds R3SnBr and R3SnH are described.
    Notes: Thermische und reversible Dissoziation organischer Distannane R3Sn-SnR3 (1) ⇄ 2 R3Sn. (2) konnte erstmalig nachgewiesen werden, wenn durch sperrige Reste R eine genügende Spannung in 1 erzeugt wurde. Bis 230°C reichen die Reste R = Phenyl, Cyclohexyl, 1-Adamantyl hierfür nicht aus, jedoch mit R = 2,4,6-Trialkylphenyl sinkt die Dissoziationstemperatur (ESR) in der Reihe Alkyl = Me, Et, iPr bis auf 20°C ab. ESR-Spektren der Stannylradikale 2 sowie vSn-Sn(sym.)-[Raman], δHDiss.- und EA-Werte für 1 werden angegeben. Neue Distannane 1 und zugehörige Verbindungen R3SnBr und R3SnH werden beschrieben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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