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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 101 Synthesis and Properties of Diphosphaboriranes (t-BuP)2BNR2 and (t-BuP)2BNR1R2The reaction of K(t-Bu)P—P(t-Bu)K with diorganylaminodichloroboranes under suitable conditions leads to the new 1,2-di-tert-butyl-3-diorganylamino-1,2,3-diphosphaboriranes (-1,2-diphospha-3-boracyclopropanes) (t-BuP)2BNR2 (2, 7) and (t-BuP)2BNR1R2 (3 - 6), respectively. The P2B three-membered heterocycles 2 - 5 can be isolated in good yields. They are relatively stable against dimerization to the corresponding phosphorus boron six-membered ring compounds with opposite boron atoms. The rate of dimerization depends on steric and electronic influences of the substituents at the three-membered ring. All NMR spectroscopic results are only consistent with a structure in which the B and N atoms show planar coordination and are connected by a partial double bond.
    Notes: Díe Reaktion von K(t-Bu)P—P(t-Bu)K mit Diorganylaminodichlorboranen führt unter geeigneten Bedingungen zu den neuen 1,2-Di-tert-butyl-3-diorganylamino-1,2,3-diphosphaboriranen (-1,2-diphospha-3-bora-cyclopropanen) (t-BuP)2BNR2 2 und 7 bzw. (t-BuP)2BNR1R2 3 - 6. Die P2B-Dreiring-Heterocyclen 2 - 5 können in guter Ausbeute isoliert werden und sind gegenüber Dimerisierung zu den entsprechenden Phosphor-Bor-Sechsringverbindungen mit gegenüberliegenden Boratomen verhältnismäßig beständig. Die Dimerisierungsgeschwindigkeit hängt von sterischen und elektronischen Einflüssen der Substituenten am Dreiring ab. Die Gesamtheit der NMR-spektroskopischen Befunde ist nur mit einer Struktur vereinbar, in der die B- und N-Atome planar koordiniert sind und eine partielle B—N-Doppelbindung vorliegt.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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