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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1052-1060 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Azaborolinyl Complexes, XIII. Synthesis and Properties of Bis(1-tert-butyl-2-methyl-η3-1,2-azaborolinyl)nickelThe reaction of 1-tert-butyl-2-methyl-1,2-azaborolinyllithium (1) with NiBr2 leads to the sandwich complex bis(1-tert-butyl-2-methyl-η3-1,2-azaborolinyl)nickel (2). For the first time it is noticed that the azaborolinyl ring does not serve as η5 but as η3 ligand. The 1H NMR spectrum shows the existence of two isomers (2a,b), one of them could be investigated by X-ray analysis. As a result only the three ring carbon atoms possess binding distances to the nickel atom, whereas boron and nitrogen do not show any covalent interactions with the metal. The position of the signals of the ring protons in the 1H NMR spectrum differs characteristically from the position in other azaborolinyl sandwich complexes and in π-allyl compounds.
    Notes: Die Reaktion von 1-tert-Butyl-2-methyl-1,2-azaborolinyllithium (1) mit NiBr2 führt zum Sandwichkomplex Bis(1-tert-butyl-2-methyl-η3-1,2-azaborolinyl)nickel (2). Erstmals wird beobachtet, daβ der Azaborolinyl-Ring nicht als η5-, sondern als η3-Ligand dient. Das 1H-NMR-Spektrum zeigt das Vorliegen von zwei Isomeren (2a,b), von denen eines röntgenstrukturanalytisch untersucht werden konnte. Danach haben nur die drei Ringkohlenstoffe bindende Abstände zum Nickelatom, während Bor und Stickstoff keine kovalenten Wechselwirkungen mit dem Metall zeigen. Die Lage der Ringprotonen-Signale im 1H-NMR-Spektrum weicht charakteristisch von der Lage in anderen Azaborolinyl-Sandwichkomplexen und in π-Allylverbindungen ab.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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