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  • 1
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, CII. Synthese und Reaktionen von 1-Stanna-4-bora-2,5-cyclohexadienen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1235-1244 
    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, CII. Synthesis and Reactions of 1-Stanna-4-bora-2,5-cyclohexadienesHydrostannation of (dialkylamino)dialkinylboranes 1 with dimethylstannane yields 1,1-dimethyl-1-stanna-4-bora-2,5-cyclohexadienes 2. Additional 4-amino derivatives are accessible via trans-amination reactions. Solvolysis of the amino derivatives by alcohols leads to alkoxy derivatives 3. These are alkylated by aluminium alkyls or tert-butyllithium to 4-alkyl-1,1-dimethyl-1-stanna-4-boracyclohexadienes 5. A considerable difference in the chemical behaviour of the 1,1-dimethyl-and the 1,1,2,6-tetramethyl derivatives has been observed.
    Notes: Die Hydrostannierung von (Dialkylamino)dialkinylboranen 1 mit Dimethylstannan führt zu 1,1-Dimethyl-1-stanna-4-bora-2,5-cyclohexadienen 2. Über Transaminierung sind weitere 4-Amino-Derivate zugänglich. Die Solvolyse der Amino-Derivate mit Alkoholen liefert die Alkoxyderivate 3, die mit Aluminiumalkylen bzw. mit tert-Butyllithium zu 4-Alkyl-1,1-dimethyl-1-stanna-4-boracyclohexadienen 5 alkyliert werden. Zwischen den 1,1-Dimethyl- und den 1,1,2,6-Tetramethyl-Derivaten bestehen beträchtliche Unterschiede im chemischen Verhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130404
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  • 2
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Bors, CI. Bildung und NMR-Spektren von nido-2,3,4,5-Tetracarbahexaboran(6)-Derivaten (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2884-2893 
    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, CI. Formation and NMR Spectra of nido-2,3,4,5-Tetracarbahexaborane(6) Derivativesnido-2,3,4,5-Tetracarbahexaborane(6) derivatives (4, 6,7) result from the reaction of 1-stanna-4-bora-2,5-cyclohexadiene 1 or 3-diethylboryl-1-stannacyclopentadiene 5 with methylboron dibromide. Here, the reaction of 1 with CH3, BBr2; yields a 1-bora-3-cyclopentene (2, 3) as an intermediate. The 1H-, 11B-, and 13C-NMR parameters of the new compounds are discussed and compared with the data of other nido-hexaborane derivatives.
    Notes: nido-2,3,4,5-Tetracarbahexaboran(6)-Derivate (4, 6, 7) entstehen bei der Umsetzung von 1-Stanna-4-bora-2,5-cyclohexadien 1 und 3-Diethylboryl-l-stannacyclopentadien 5 mit Methylbordibromid. Dabei durchläuft die Reaktion mit 1 die Zwischenstufe eines 2,5-diborylierten 1-Bora-3-cyclopentens (2, 3). Die 1H-, 11B- und 13C-NMR-Parameter der neuen Verbindungen werden im Zusammenhang mit den Daten anderer nido-Hexacarborane diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120814
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  • 3
    Electronic Resource
    Electronic Resource
    Die Bor-Halogen-Bindung in Methylhalogenboranen: Photoelektronenspektren und ab initio-Rechnungen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 2266-2290 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Boron-Halogen Bond in Methylhalogenoboranes: Photoelectron Spectra and ab initio CalculationsHe(I) photoelectron (p.e.) spectra of the methylhalogenoboranes (CH3)3-nBXn (X = F, Cl, Br; n = 1,2) are discussed in comparison with known p.e. spectra of the trihalogenoboranes BX3 and of trimethylborane B(CH3)3 on the basis of ab initio calculations. Correlations of orbital and ionization energies, of π-charge densities and 11B chemical shifts as well as calculated and measured dipole moments give insight into the electronic structure of tricoordinate boron compounds with substituents such as X = F, Cl OCH3 SCH3, N(CH3)2, and CH3.
    Notes: Die He(I)-Photoelektronen(PE)-Spektren der Methylhalogenborane (CH3)3-nBXn (X = F, Cl, Br; n = 1,2) werden mit den bekannten PE-Spektren der Trihalogenborane BX3 und des Trimethylborans B(CH3)3 an Hand von ab initio-Rechnungen vergleichend diskutiert. Korrelationen von Orbital-und Ionisierungsenergien, von π-Ladungsdichten und 11B-Kernresonanzverschiebungen sowie von berechneten und gemessenen Dipolmomenten vermitteln Einblicke in die Bindungsverhältnisse dreifach koordinierter Bor-Verbindungen mit den Substituenten X = F, Cl, OCH3, SCH3, N(CH3)2 und CH3.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090633
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  • 4
    Electronic Resource
    Electronic Resource
    Kernresonanzspektroskopische Untersuchungen an 1-Hetero-4-stanna-2,5-cyclohexadienen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2866-2883 
    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 Investigations on 1-Hetero-4-stanna-2.5-cyclohexadienesNMR data (1H, 11B, 13C, 14N, 29Si, 31P, 119Sn) of 1-hetero-4-stanna-2,5-cyclohexadienes are reported. Chemical shifts and coupling constants of the various nuclei indicate in many cases a non-planar six-membered ring system.
    Notes: NMR-Daten (1H, 11B, 13C, 14N, 29Si, 31P, 119Sn) von 1-Hetero-4-stanna-2,5-cyclohexadienen werden mitgeteilt. Aufgrund der chemischen Verschiebungen und Kopplungskonstanten läßt sich in vielen Fällen eine nichtebene Ringstruktur ableiten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120813
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