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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 1117-1126 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stabilisation and Reactions of Iminoboranes - Crystal Structure of (tert-Butylimino)[tris(trimethylsilyl)silyl]boraneThe lithium salts of tris(trimethylsilyl)methane (1) and -silane (2) react with aminohalogenoboranes to give the substitution compounds 3-13. Chloro[tris(trimethylsilyl)methyl](2,2,6,6-tetramethylpiperidino)borane (12) is isolated as THF adduct In contrast to methyl-, ethyl- and isopropyl(trimethylsilyl)amino compounds (3-7) the bis(trimethylsilyl)-(8, 9) and the tert-butyl(trimethylsilyl)amino compounds (10, 11) thermally loose fluorotrimethylsilane with formation of stable iminoboranes (14-17). - 18 is obtained by methanol addition to 14, 19 and 20 by mesitylamine addition to 16 and 17, respectively. The hydrolysis of 14 leads to the formation of the amino(trisilylmethyl)boranol (Me3Si)3C—B(OH)-NHSiMe3 (21). The second product of hydrolysis of 14 (22) is obtained by atmospheric moisture from 21. 22 does not condense to the boroxine in an anhydrous medium. The crystal structure of 17 shows the shortest boron-nitrogen bond length found so far.
    Notes: Die Lithiumsalze des Tris(trimethylsilyl)methans (1) und -silans (2) reagieren mit Aminohalogenboranen zu den Substitutionsverbindungen 3-13. Chlor[tris(trimethylsilyl)-methyl](2,2,6,6-tetramethylpiperidino)boran (12) wird als THF-Addukt isoliert. Im Gegensatz zu den Methyl-, Ethyl- und Isopropyl(trimethylsilyl)amino-Verbindungen (3-7) verlieren Bis(trimethylsilyl)- (8, 9) und die tert-Butyl(trimethylsilyl)amino-Verbindungen (10, 11) thermisch Fluortrimethylsilan unter Bildung stabiler Iminoborane (14-17). - 18 wird durch Methanoladdition an 14 gebildet, 19 und 20 entstehen durch Addition von Mesitylamin an 16 und 17. Die Hydrolyse von 14 führt zur Bildung des Amino(trisilylmethyl)-boranols (Me3Si)3C—B(OH)-NHSiMe3 (21). Das zweite Hydrolyseprodukt von 14 (22) entsteht durch die Einwirkung von Luftfeuchtigkeit auf 21. 22 kondensiert im wasserfreien Medium nicht zum Boroxin. Die Kristallstruktur von 17 zeigt die bislang kürzeste gefundene Bor-Stickstoff-Bindungslänge.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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