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  • 2,4,6-Tri-t-butylphenyl-substituted amino-imino boranes  (1)
  • Didemnin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 147-152 
    ISSN: 0044-2313
    Keywords: 2,4,6-Tri-t-butylphenyl-substituted amino-imino boranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Supermesityl stabilized IminoboranesAmino-iminoboranes R′(SiMe3)N-B≡N-R: IIc (R′ = CHMe2), IId (R′= CMe3) and IIe (R′ = SiMe3) carrying the supermesityl group (R) on the imino nitrogen atoms have been prepared from the corresponding fluorobis(amino)boranes Ic-e by HF-elimination using t-BuLi (IIc, d) or n-lithio-bis(trimethylsilyl)amid (IIe). The Amino-iminoboranes are thermally stable at room temperature. Upon treatment of the fluorobis(amino)boranes Ia, Ib, Ie with t-BuLi, LiF and HN(SiMe3)R′ are eliminated and the B-t-butyl substituted iminoborane III is formed. The compounds are characterized by elementar analyses and spectroscopic data (MS, IR, NMR). An X-ray diffraction study has been performed for II d.
    Notes: Amino-imino-borane R′(SiMe3)N-B≡N-R:IIc (R′ = CHMe2), IId (R′= CMe3) und IIe (R′ = SiMe3) mit R = 2,4,6-Tri-t-butylphenyl- wurden aus den entsprechenden Fluorbis(amino)boranen Ic-e durch HF-Eliminierung mit t-Butyllithium (IIc, IId) bzw. Lithiumbis(trimethylislyl)amid (IIe) erhalten. IIc-e sind thermisch stabil und bei Raumtemperatur unbegrenzt haltbar. Die Umsetzungen der Fluorbis(amino)borane Ia (R′ = Me), Ib(R′ = CH2Me) und Ie (R′ = SiMe3) mit t- Butyllithium führen zur Abspaltung von LiF und HN(SiMe3)R′, wobei sich in allen Fällen des B-t-butyl-substituierte Iminoboran III bildet. Die Verbindungen sind elementaranalytisch und spektroskopisch (MS, IR, NMR) charakterisiert. Eine Röntgenstrukturanalyse wurde von IId durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 501-506 
    ISSN: 0749-1581
    Keywords: Cyclic depsipeptide ; Inverse COLOC ; Inverse HMQC ; Semi-selective excitation ; NMR assignments in peptides ; Didemnin ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several one- and two-dimensional techniques have been used to assign the 1H and 13C NMR spectra of the cyclic heptadepsipeptide didemnin A in DMSO. The composition and sequence of the amino acid residues was known beforehand and could be confirmed by heteronuclear proton-carbon long-range couplings using the COLOC experiment and a recently proposed new inverse technique using Gaussian-shaped pulses. The aliphatic methyl resonances of the isostatin, hydroxyisovalerylpropionyl, N-methylleucine and leucine residues were assigned by means of the TOCSY and NOESY techniques. Aliphatic carbon assignment was performed by inverse correlation via heteronuclear double quantum coherence.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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