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  • Chemistry  (5)
  • 1975-1979  (5)
  • 1925-1929
  • 1978  (5)
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  • 1975-1979  (5)
  • 1925-1929
Year
  • 1
    Electronic Resource
    Electronic Resource
    Reaktionen an komplexgebundenen Carbenanalogen, II: Synthese und Schwingungsspektren von Pentacarbonyl[chlor-(di-tert-butylphosphino)stannylen]metall(VI A)-Komplexen (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 2267-2272 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Complex-bound Carbene Analogues, II: Synthesis and Vibrational Spectra of Pentacarbonyl[chloro(di-tert-butylphosphino)stannio]-metal(VI A) ComplexesThe tindichloride complexes pentacarbonyl(dichlorotetrahydrofurane-stannio)chromium(0) (1), -molybdenum(0) (2) and -tungsten(0) (3) react with di-tert-butyl(trimethylsilyl)phosphine with elimination of tetrahydrofurane and formation of chlorotrimethylsilane to give the new, base free stannio complexes (CO)5M—Sn(Cl)[P(tBu)2] (4-6: M = Cr, Mo, W) with 75 to 85% yield. The ligand properties of chloro(di-tert-butylphosphino)-stannandiyl (-stannylene) are discussed on the basis of infrared and Raman data, and other physical properties.
    Notes: Die SnCl2-Metallkomplexe Pentacarbonyl(dichlortetrahydrofuran-stannio)chrom(0) (1), -molybdän(0) (2) und -wolfram(0) (3) reagieren mit Di-tert-butyl(trimethylsilyl)phosphin unter Verdrängung von Tetrahydrofuran und Eliminierung von Chlortrimethylsilan, wobei die neuen basenfreien Stannylenkomplexe (CO)5M—Sn(Cl)[P(tBu)2] (4-6: M = Cr, Mo, W) in 75-85 proz. Ausbeute erhalten werden. Die Ligandeneigenschaften von Chlor(di-tert-butylphosphio)stanandiyl (-stannylen) werden anhand von IR- und Raman-Daten sowie der physikalischen Eigenschaften von Ligand und Komplexen diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110621
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  • 2
    Electronic Resource
    Electronic Resource
    Statistics of polyfunctional polycondensates formed under restrictions (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1821-1835 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The scattering behaviour and the critical conditions where gelation takes place have been calculated for polycondensates formed under constraints. The general model includes fully random and stringently restricted reactions as limiting cases. Also polycondensates of glycerine-type monomers are included as special cases. The particle scattering factors of the f-functional random polycondensates differ remarkably from those polycondensates formed under strict constraints. The former show a Kratky plot of a simple curve, independent of the magnitude of the molecular weight and the number of functional groups, and the curve approaches a constant asymptote of u2·Pz(u)=3, the latter exhibits a maximum at u2=6 which becomes more pronounced with increasing molecular weight, (u2 = 〈S2〉zh2, with h, the value of the scattering vector). The scattering curves of the polycondensates formed under weak constraints show at low molecular weights the same behaviour as those formed under stringent constraints, but approach the behaviour of random polycondensates at large molecular weights. The scattering curves of the glycerine-type polycondensates show no deviations in shape from random polycondensates.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790717
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative study of the hydrodynamic properties of cellulose and amylose tricarbanilates in dilute solutions viscosity, sedimentation and diffusion measurements in 1,4-dioxane in the molecular weight range of 500 ≤M≤ 5·106Part of Dissertation W. Sutter, Freiburg 1970. (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1961-1980 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Comparative hydrodynamic measurements were performed for cellulose tricarbanilates (CTC) and amylose tricarbanilates (ATC) - covering the whole region from the monomer up to the highest available molecular weight of 3,6 . 106.The intrinsic viscosity vs. molecular weight relationships exhibit in both cases characteristic S-shaped curves. In the region of oligomers the intrinsic viscosities remain almost constant; it follows then a steep increase with molecular weight which finally flattens out to constant slopes for high molecular weights. In the high molecular weight region the curves may be approximated by Kuhn-Mark-Houwink equations with exponents of 0,90 and 0,88 for CTC and ATC, respectively. The intrinsic viscosities are by a factor two smaller for ATC than for CTC. The S-shaped curves are interpreted as a result of the finite cross-section of the chains and a certain chain stiffness. Stockmayer-Fixman plots gave strongly bent curves which is shown to be due to chain rigidity.Sedimentation coefficients and diffusion constants as functions of the molecular weight approach straight lines in a double logarithmic plot for large molecular weights; for shorter chains characteristically bent curves are obtained which are ascribed to chain stiffness and finite chain cross-section.The origin of chain stiffness in CTC is discussed to be due to H-bond formation between the NH-group of the substituent in C2 position of the sugar ring and a CO-group of the substituent in C6 of a neighbouring repeating unit. This interpretation is supported by the low viscosity of mannan tricarbanilate (MTC), in which the facility of H-bond formation is lost and higher flexibility is obtained.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790810
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  • 4
    Electronic Resource
    Electronic Resource
    Use of Nafion Perfluorosulfonic Acid Products as Separators in Electrolytic CellsPaper presented at the Congress of the GdCh-Section, „Applied Electrochemistry“ at Darmstadt, October 6-7, 1977. (1978)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 299-301 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330500415
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  • 5
    Electronic Resource
    Electronic Resource
    Zur katalytischen Dimerisierung von Propionaldehyd druch Gemischt-Ligand-Nickel(O)-Komplexe (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 440 (1978), S. 22-30 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Catalytical Dimerisation of Propione Aldehyde by Mixed Ligand-Nickel(O)ComplexesThe reaction of carbonyl compounds with mixed ligand-nickel(O) complexes is described with propione aldehyde as an example. A catalytical conversion of propione aldehyde to α-methyl-β-ethyl-acroleine is found in a high yield. This reaction is influenced by neutralligands bonded at the nickel atom. A complexcoordinative mechanism is provided by pattern reactions. An essential intermediate  -  2, 2′-bipyridine-α-methyl-β-ethyl-acroleine-nickel(O)  -  is isolated. The solvatochromic and thermochromic effects of this compound are discussed.
    Notes: Die Reaktion von Carbonylverbindungen mit bestimmten Gemischt-Ligand-Nickel(O)-Komplexen wird am Beispiel von Propionaldehyd behandelt. Dabei wird eine katalytische Umwandlung des Propionaldehyds in α-Methyl-β-ethyl-acrolein mit hohen Ausbeuten gefunden. Diese Reaktion wird in definierter Weise durch an Nickel gebundene Neutralliganden beeinflußt. An Hand von Modellreaktionen wird ein komplex-koordinativer Reaktionsmechansimus vorgeschlagen. Ein wesentliches Zwischenprodukt der Katalyse, das 2, 2′-Bipyridin-α-methyl-β-ethyl-acrolein-nickel(O) wird isoliert. Die Solvatochromie und Thermochromie dieser Verbindung werden diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784400102
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