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  • Inorganic Chemistry  (4)
  • (Sea cucumber)  (1)
  • 21.10  (1)
  • 1
    ISSN: 0304-4165
    Keywords: (Sea cucumber) ; Carbohydrate structure ; Fucose derivative ; Glycoprotein ; Neuraminic acid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 347 (1993), S. 15-20 
    ISSN: 1434-601X
    Keywords: 21.10 ; 27.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microscopic description of negative parity states in the nucleus68Ge is presented. The investigation is based on the EXCITED VAMPIR model in which via a chain of variational calculations first an optimal configuration space ofi symmetry-projected Hartree-Fock-Bogoliubov determinants for thei lowest states of a given symmetry is constructed and subsequently the residual interaction is diagonalised. Though some considerable quantitative discrepancies are obtained, qualitatively the theoretical results agree rather nicely with the complex pattern of negative parity states in this nucleus which has been recently found experimentally. Underlying structures and electromagnetic properties are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 441 (1978), S. 125-164 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Formation of Organosilicon Compounds. 72. The Reactivity of Carbosilanes and their C-Chlorinated Derivatives in Reactions with CH3MgCl and LiCH3Reactions of (H3Si—CH2)2SiH2 1, (H2Si—CH2)3 2, (H3Si)2CCl2 3, (H3Si)2CHCl 4, H3Si—CCl2—SiH2-CH2-SiH3 5, and (H3Si—CCl2)2SiH2 6 as well as H3SiCH2Cl, H3SiCHCl2, and H3SiCCl3 with meMgCl and Lime (me = CH3) respectively are reported. In 1 and 2 by using tetrahydrofurane (THF) as a solvent, methylation to a higher degree is possible. The C-chlorination increases the activation of the Si—H group. Reactions of the C-chlorinated compounds result in Si—H substitution (maintaining of molecular frame), in cleavage and enlargement of the molecular frame and in transformation of CCl2 group into CHCl and CH2 groups respectively. Reactions with meMgCl in THF and with Lime in diethylether (Et2O) favour the cleavage of the molecular and the hydrogenation of the CCl2 group. The methylation of compound 5 occures on the Si—H groups neighbouring the CCl2 groups. The reactivity of these Si—H groups is decreased by increasing methylation. Reacting compound 6 with meMgCl in Et2O cleavage reations dominate. However, using cyclohexane as a solvent this cleavage reaction recedes in favour of the formation of 1,3,5-trisilapentane, containing a CCl2 group and a CHCl or a CH2 group. Thereby however, the methylation of only two SiH groups is observed. The 1H-, 29Si-, and 13C-n.m.r. data allow an assessment of progressing SiH-methylation within the homologous series.
    Notes: Es wird über Umsetzungen von (H3Si—CH2)2SiH2 1, (H2Si—CH2)3 2, (H3Si)2CCl2 3, (H3Si)2CHCl 4, H3Si—CCl2—SiH2—CH2-SiH3 5 und (H3Si—CCl2)2SiH2SiH2 6 sowie von H3Si—CH2Cl, H3Si—CHCl2, H3Si—CCl3 mit meMgCl bzw. Lime (me = CH3) berichtet. In 1 und 2 werden durch Verwendung von Tetrahydrofuran (THF) als Lösungsmittel höhere Methylierungsstufen ermöglicht. Die C-Chlorierung bewirkt eine Aktivierung der Si—H-Gruppe. Die C-chlorierten Verbindungen reagieren unter Si—H Substitution (Erhalt des Molekülgerüstes), unter Spaltungen und Vergrößerungen des Molekügerüstes und unter Hydrierung der CCl2-Gruppe zu der CHCl- bzw. CH2-Gruppe. Bei Umsetzungen mit meMgCl in THF oder mit Lime in Diäthyläther (Et2O) werden Reaktionen begünstigt, die unter Molekülspaltung und CCl2-Hydrierung ablaufen. In 5 beginnt die Methylierung an den der CCl2-Gruppe benachbarten SiH-Gruppen, deren Reaktionsfähigkeit mit steigendem Methylierungsgrad sinkt. Bei 6 bestimmen die Si—C-Spaltungen den Reaktionsablauf (Umsetzung mit meMgCl in Et2O), der aber durch Verwendung von Cyclohexan als Lösungsmittel zurückgedrängt wird zugunsten der Bildung von 1,3,5-Trisilapentanen mit einer CCl2- und einer CHCl- oder CH2-Gruppe, wobei aber nur maximal die Methylierung von zwei SiH-Gruppen erreicht wird. Die 1H-, 29Si- und 13C-NMR-Daten erlauben eine Abschätzung des Verlaufs der SiH-Methylierung innerhalb der homologen Reihen.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 345 (1966), S. 93-105 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The preparation, structure, thermal decomposition and IR spectrum of (Me3Si)2NH → MCl3 (M = Al, Ga) and (Me3Si)3N → AlCl3 (Me = CH3) are reported. Attemps to prepare [(Me3Si)4N]+[SbF6]- are described. From the IR spectrum of (Me3Si)2NH → MCl3 the force constant of the Si—N single bond has been calculated to be 2.87 ± 0.13 mdyn/Å.
    Notes: Es werden Darstellung, Struktur, Thermolyse und Infrarotspektren der Ammoniumverbindungen (Me3Si)2NH → MCl3 (M = Al, Ga) und (Me3Si)3N → AlCl3 (Me = CH3) sowie Darstellungsversuche für [(Me3Si)4N]+[SbF6]- beschrieben. Als Ergebnis einer quantitativen Auswertung der Infrarotspektren im Falle der Verbindungen (Me3Si)2NH → MCl3 ließ sich die Kraftkonstante der Si—N-Einfachbindung zu 2.87 ± 0.13 mdyn/Å festlegen.
    Additional Material: 1 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 394 (1972), S. 197-208 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Beryllium dichloride, magnesium dihalide (hal = Cl, Br, J), boron trihalide (hal = F, Cl, Br) and aluminium trichloride are transformed by trimethylsilyl azide in methylen chloride and ether, respectively, to dimer beryllium chloride azide etherate, polymer beryllium diazide, polymer magnesium halide azide, trimer boron dihalide azide, monomer (in CH3Cl2) aluminium dichloride azide and polymer aluminium chloride diazide, respectively. Magnesium diazide and aluminium triazide are formed by azidation of magnesium diiodide and aluminium trichloride only in connection with magnesium iodide azide and aluminium chloride diazide, respectively. Unlike the covalent azides of beryllium, boron and (possibly) aluminium with α-azido brigdes, the azides of magnesium contain azide ions.
    Notes: Berylliumdichlorid, Magnesiumdihalogenid (Hal = Cl, Br, J), Bortrihalogenid (Hal = F, Cl, Br) bzw. Aluminiumtrichlorid lassen sich mit Trimethylsilylazid in Methylenchlorid bzw. Äther in dimeres Berylliumchloridazid-Ätherat, polymeres Berylliumdiazid, polymeres Magnesiumhalogenidazid, trimeres Bordihalogenidazid, monomeres (in CH2Cl2) Aluminiumdichloridazid bzw. polymeres Aluminiumchloriddiazid überführen. Magnesiumdiazid bzw. Aluminiumtriazid bilden sich durch Azidierung von Magnesiumdijodid bzw. Aluminiumtrichlorid nur im Gemisch mit Magnesiumjodidazid bzw. Aluminiumchloriddiazid. Zum Unterschied von den kovalent gebauten Aziden des Berylliums, Bors und (möglicherweise) Aluminiums mit α-Azidbrücken, enthalten die Azide des Magnesiums ionogen gebundenes Azid.
    Additional Material: 2 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1499-1500 
    ISSN: 0044-2313
    Keywords: Methylindium Compound ; Heterocubane ; Synthesis ; X-ray Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The X-Ray Structure Determination of tert-Butylimido Methylindane, [CH3In—NC(CH3)3]4The reaction of MeInCl2 with LiN(H)tBu in a 1 : 2 molar ratio forms [MeIn—NtBu]4 in high yield, lithium chloride, and the free amine H2NtBu. The crystal structure of the imidomethylindane with a cubic In4N4 skeleton has been determined.
    Additional Material: 1 Ill.
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