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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Methylene Complexes, XLIII. Three- and Four-membered Dimetallacycles Having Sulfur Dioxide, Selenium, Chlorogold, and a Silver Diazoalkane as Molecular Building BlocksAs a very good π-ligand, sulfur dioxide adds under mild conditions (-80… +25°C) in fast and clean reactions to metal-metal double bonds with formation of stable 1:1 adducts that exhibit bridging sulfur dioxide ligands. Starting from the doubly bridged metal-metal double bonds of the dinuclear organorhodium- and -cobalt complexes 1a, b, 3, and 5, the novel μ-SO2 complexes 2a, b, 4, and 6, respectively, are formed. In some of these reactions, the coordination mode of the former bridging ligands changes to terminal. The first known μ-(thioformaldehyde S,S-dioxide-C,S) complexes 8a, b are achieved by means of clean electrophilic ring expansion reactions when sulfur dioxide inserts into the μ-methylene complexes 7a and 7b, respectively. Elemental selenium (9a), carbonyl(chloro)gold (9b), and the silver diazoalkane 9c form the three-membered metallacycles 10a - c upon treatment with 1a.
    Notes: Schwefeldioxid addiert sich als vorzüglicher π-Ligand unter schonenden Reaktionsbedingungen (-80… +25°C) rasch und übersichtlich an Metall-Metall-Doppelbindungen unter Bildung beständiger 1:1-Addukte, in denen stets SO2-Brücken vorliegen. Ausgehend von den zweifach verbrückten Metall-Metall-Doppelbindungen der zweikernigen Organorhodium- und cobalt-Komplexe 1a, b, 3 und 5 entstehen unter teilweiser Konstitutionsisomerisierung der Brückenliganden die neuen μ-SO2-Komplexe 2a, b, 4 bzw. 6. Durch glatt verlaufende elektrophile Ringerweiterungsreaktionen der μ-Methylen-Komplexe 7a, b sind die ersten μ-(Thioformaldehyd-S,S-dioxid-C,S)-Komplexe 8a, b zugänglich. Mit elementarem Selen (9a), Carbonyl(chloro)gold (9b) und dem Silberdiazoalkan 9c bildet 1a die dreigliedrigen Ringsysteme 10a - c.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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