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  • 1
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, LXVII. Silaborazine aus Cyclosilazanen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3113-3120 
    Details
    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, LXVII. Silaborazines from CyclosilazanesPhenyldichloroborane reacts with [(CH3)2SiNH]3 (5) to yield the disilaboranine 8, the monosilaborazine 7, and/or B,B′, B″-triphenylborazine (9), depending on the ratio of the reactants. Reaction with octamethylcyclotetrasilazane, [(CH3)2SiNH]4 (12), in a 1:1 molar ratio leads to NH4Cl, 8, and a polymer. Product analysis shows that only part of 8is formed by direct SiN-cleavage, the other part results from a substitution leading to NH4Cl.
    Notes: Phenylbordichlorid reagiert je nach Molverhältnis mit [(CH3)2SiNH]3 (5) zum Disilaborazin 8, Monosilaborazin 7und/oder B,B′, B″-Triphenylborazin (9). Bei der Umsetzung mit Octamethylcyclotetrasilazan, [(CH3)2SINH] 4 (12), im Molverhältnis 1:1 entstehen NH4Cl, 8 und Polymere. Aus der Stoffbilanz folgt, daß nur ein Teil von 8über direkte Silazanspaltung entstehen Kann; der andere ist die Folge einer zu NH4Cl führenden Substitutionsreaktion.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070932
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  • 2
    Electronic Resource
    Electronic Resource
    Kernresonanzspektroskopische Untersuchungen an Borverbindungen, VI. 14N- und 11 -Kernresonanzstudien an Silylaminen und Silylaminoboranen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 518-528 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nuclear Magnetic Resonance Studies on Boron Compounds, VI. 14N- and 11B-N.M.R. Studies on Silylamines and SilylaminoboranesThe chemical shift data δ14 N of 39 silylamines [(CH3)3SiNR2, [(CH3)3Si]2NR and [(CH3)3Si]3N as well as of Si-chloro-bis(silyl)amines] are reported together with 14N-and 11B-chemical shifts of 19 silylaminoboranes. These data are discussed in terms of the SiN-(pd)-π-bonding model. Borylation of silylamines leads to a deshielding at the nitrogen. (pp)-π-Bonding between B-and N-atoms as well as geometric effects are used for the interpretation of the δ14N- and δ11 B-data.
    Notes: Die chemischen Verschiebungen δ14N von 39 Silylaminen [(CH3)3SiNR2, [(CH3)3Si]2NR, [(CH3)3Si]3N und Si-chlorierte Bis(silyl)amine] werden zusammen mit den δ14N- und δ11B-Daten von 19 Silylaminoboranen mitgeteilt. Sie sind mit dem Modell der SiN-(pd). π-Bindung interpretierbar.Die Borylierung führt zu einem Abschirmungsverlust am Stickstoff. (pp)-π-Bindung zwischen Bor- und Stickstoff sowie geometrische Effekte werden zur Deutung der δ14N-und δ 11B-Daten herangezogen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070217
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, LXIX. Synthese und NMR-Untersuchung von Silaborazin-Derivaten (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3109-3124 
    Details
    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, LXIX. Synthesis and N. M. R. Investigation of Silaborazine DerivativesDerivatives of silaborazines, six-membered B-, N-, Si-heterocyclic systems, are obtained by three methods: i) by reaction of N-lithioaminoboranes with bis(chlorosilyl)amines, ii) by transmination of (aminoborylamino)silanes, iii) by condensation of (CH3)2Si(NHCH3)2 with alkyl bis(dimethyl-amino)boranes. N.m.r. data (1H, 11B, 14N) of the new compounds suggest that the ring system of the silaborazines is not fully planar.
    Notes: Derivate der Silaborazine, sechsgliedrige B-, N-, Si-Heterocyclen, werden nach drei Verfahren erhalten: 1) durch Reaktion von N-Lithioaminoboranen mit Bis(chlorsilyl)aminen, 2) durch Transaminierung von (Aminoborylamino)silanen, 3) durch Kondensation von (CH3)2Si(NHCH3)2 mit Alkylbis(dimethylamino)boranen. Die NMR-Daten (1H, 11B, 14N) der neuen Verbindungen legen nahe, daß das Ringsystem der Silaborazine nicht völlig planar ist.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081002
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, LXVIII. Cyclische Verbindungen mit Bor, Stickstoff und Phosphor als Ringgliedern („Phosphaborazine“) (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3806-3817 
    Details
    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, LXVIII. Cyclic Compounds with Boron, Nitrogen, and Phosphorus as Ring Members (‘Phosphaborazines’)N-Metalated ‘triazaboradecalin’ reacts with (CIRP)2 NR′ and [Cl2P(O)]2NCH3, respectively, with ring formation yielding ‘phosphaborazines’ of the type 14. Ring closure to a B2N3P-ring system 17, is also achieved by SiN-cleavage from the BNSi-chain compound 15 with CH3P(O)Cl2, but BN-cleavage dominates. Spectroscopic data indicate the ring system 17 not to be planar, furthermore, that with the exception of 14a all other derivatives of 14 are formed in one geometric form only.
    Notes: N-Metalliertes„Triazaboradecalin“ reagiert mit ( (CIRP)2 NR′ bzw. [Cl2P(O)]2NCH3 unter Ringschluß zu„Phosphaborazinen“ des Typs 14. Die Heterocyclensynthese zu einem B2N3P-Ringsystem 17 gelingt auch durch SiN-Spaltung der BNSi-Kettenverbindung 15 mit CH3 P(O)Cl2, wobei allerdings die BN-Spaltung dominiert. Die spektroskopischen Daten legen ein nicht planares Ringsystem 17 nahe. Mit Ausnahme von 14a werden alle Derivate von 14 in geometrisch einheitlicher Form erhalten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071211
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