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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2140-2156 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Boron, 138. N-Borylated Derivatives of Phosphoric Amides: Examples of Intermolecular Borotropy(Phosphorylamino)boranes of the type X2P(O) - NR′ - BR2 (1 - 10) as well as [Cl2P(O) - NH]3B (11) have been prepared by several methods. Monomeric compounds are present in solution for X = R = N(CH3)2 and borotropic isomers X2P(NR′) - O - BR2 were detected for X = Cl, N(CH3)2 and R = CH3. The borotropic equilibrium is established intermolecularly via dimers. This equilibrium lies fully on the side of the dimers for X = R = Cl and X = Cl, R = Br, respectively. This was ascertained for [Cl2P(O) - NC6H5 - BCl2]2 (16) by an X-ray structure determination: the monomeric unit dimerizes to a molecule containing an eight-membered ring having a chair-like conformation.
    Notes: (Phosphorylamino)borane vom Typ X2P(O) - NR′ - BR2 (1 - 10) sowie [Cl2P(O) - NH]3B (11) wurden nach verschiedenen Methoden dargestellt. Neben monomeren Verbindungen (X = R = N(CH3)2) liegen in Lösung laut NMR-Spektren auch borotrope Isomere X2P(NR′) - O - BR2, z. B. für X = Cl, N(CH3)2; R = CH3, vor. Das borotrope Gleichgewicht stellt sich über Dimere intermolekular ein. Im Falle von X = R = Cl bzw. X = Cl, R = Br liegt dieses Gleichgewicht völlig auf der Seite des Dimeren. Dies bestätigt eine Röntgenstrukturanalyse von [Cl2P(O) - NC6H5 - BCl2]2 (16): das Monomere dimerisiert zu einem Molekül mit gewellter Achtringstruktur von sesselähnlicher Konformation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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