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  • 1
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 473 (1981), S. 139-152 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bor-Stickstoff-Verbindungen. 88. Borderivate von pyridylalkylaminenDie Umsetzung von 2-Aminomethylpyridin oder 2-Aminoäthylpyridin mit Trialkylboranen im Molverhältnis 1:2 führt zu Zwischenprodukten, deren Thermolyse (2-Pyridylalkylamino)dialkylborane C5H4N—2-(CH2)n—NH—BR2 (n = 1, 2; R = C2H5, n-C3H7) ergibt. Kernresonanzspektroskopische Untersuchungen an diesen Verbindungen zeigen, daß im Falle von R = C2H5 ein intramolekularer bicyclischer Komplex mit vierbindigem Bor vorliegt. Ist R = C3H7, so liegt für n = 1 eine entsprechende Struktur neben der nicht koordinierten Verbindung mit dreibindigem Bor vor, während für n = 2 ausschließlich letztere Struktur existiert. Das Verhalten der beiden Basen bei Umsetzungen mit vierfach koordiniertem Bor ist dagegen gleichartig. So findet mit Trimethylamin-Boran in beiden Fällen gleichzeitige Basenverdrängung und Kondensation statt, was zu Amin-Aminoboranen H2B—NH—(CH2)n—C5H4N—BH3 führt, während die Reaktion mit Trimethylamin-Iodboran unter Verdrängung von Base und Iodidion zu Boronium(1+)-Salzen führt.
    Notes: 2-Aminomethylpyridine and 2-aminoethylpyridine, when reacted in a 1:2 molar ratio with trialkylboranes, form intermediates which on pyrolysis yield (2-pyridylalkylamino)dialkylboranes, C5H4N—2-(CH2)n—NH—BR2 (n = 1 or 2; R = C2H5, n-C3H7). Nuclear magnetic resonance data show that if R = C2H5 the compounds exist in an intramolecular coordinated bicyclic structure containing four-coordinate boron. If R = C3H7, the species with n = 1 exists in both the noncoordinated (with trigonal boron) as well as the bicyclic coordinated form, but with n = 2 the compound exists exclusively in the open form with trigonal boron.  -  The two cited bases are similar in their reactivity with tetracoordinated boron derivatives. With trimethylamine-borane, both amines undergo identical simultaneous base displacement and condensation to yield amine-aminoboranes, 2-[H2B—NH—(CH2)n]C5H4N—BH3, while in the case of trimethylamine-iodoborane base displacement and iodide ion displacement occurs with either pyridine derivative to yield a boronium(1+) salt.
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