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  • 1
    Electronic Resource
    Electronic Resource
    Gold-Komplexe von Diphosphinomethanen, III. AuII-Verbindungen durch oxidative Addition von Halogen (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2758-2764 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold Complexes of Diphosphinomethanes, III. AuII Compounds by Means of Oxidative Addition of HalogenOxidative addition of halogen to the 1:2 complexes of bis(diphenylphosphino)methane and -propane with AuCl (1a, 5) leads to products which are formulated partly as AuI/AuIII compounds (2a, b), but partly also as true AuII derivatives (6a, b). The addition of iodine to the AuI complex yields an adduct of the type 4. For the characterisation of the largely insoluble materials, infrared, Mössbauer, and ESCA spectroscopy have been employed.
    Notes: Durch oxidative Addition von Halogen an 1:2-Komplexe von Bis(diphenylphosphino)methan und -propan mit AuCl (1a, 5) entstehen Produkte, die teilweise als AuI/AuIII-Verbindungen (2a, b), teilweise aber auch als echte AuII-Derivate zu formulieren sind (6a, b). Die Anlagerung von Iod an den AuI-Komplex liefert nur ein Addukt vom Typ 4. Zur Charakterisierung der fast ausnahmslos unlöslichen Substanzen wurden die Infrarot-, Mössbauer-und ESCA-Spektroskopie herangezogen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100811
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  • 2
    Electronic Resource
    Electronic Resource
    Abfangreaktionen kurzlebiger Radikale, XV. Zum Mechanismus des induzierten radikalischen Zerfalls (SH2-Reaktion) von Peroxycarbonsäure-estern (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 1628-1635 
    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 Short-Life Radicals, XV. Mechanism of the Induced Radical Degradation (SH2.Reaction) of Esters of Peroxycarboxylic AcidsBy means of carbonyl-18O labeling it is shown that the tert-butyl ester of perbenzoic acid (1) is attacked by stannyl radicals R3Sn· predominantly or, more probably, exclusively at the peroxide O-atom connected to the acyl moiety, giving stannyl esters of the benzoic acid 2 via an SH2-reaction. A subsequent exchange of the labeled O-atoms (2 ⇌ 3) may occur, but it is hindered in the sequence R = Me 〈 Et 〈 Bu 〈 Ph. Stannyl esters of carboxylic acids exchange their stannyl moieties with stannyl radicals at once even at 20°C, also with organotin hydrides (following a non-radical mechanism). Trityl radicals have only a very weak inducing effect on the decomposition of unlabeled 1: τ½ = 9.4 h instead of 17.2 h at 102°C. With dibutyl ether τ½ = 0.95 h at 100°C. A mechanism like that with R3Sn· has been established by labeling of 1.
    Notes: Durch Carbonyl-18O-Markierung im Perbenzoesäure-tert-butylester (1) wurde festgestellt, daß Stannyl-Radikale R3Sn· bei der zu Benzoesäure-stannylestern 2 führenden SH2-Reaktion zumindest überwiegend, wahrscheinlich ausschließlich am acylseitigen O-Atom der Peroxidbrücke angreifen. Ein nachträglicher Austausch der Markierung (2 ⇌ 3) kann auftreten, ist jedoch erschwert in der Reihe R = Me 〈 Et 〈 Bu 〈 Ph. Carbonsäure-stannylester tauschen ihre Stannylreste sofort schon bei 20°C mit Stannyl-Radikalen aus, ebenso mit Organozinnhydriden (hier nichtradikalisch). Trityl-Radikale induzieren den Zerfall von nichtmarkierter Verbindung 1 nur sehr schwach: τ½ = 9.4 h statt 17.2 h bei 102°C. Dibutylether erzielt τ½ = 0.95 h bei 100°C. Markierung in 1 erwies einen gleichen Mechanismus wie bei R3Sn·.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100506
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  • 3
    Electronic Resource
    Electronic Resource
    Orientierungseffekte auf Charge-Transfer-Wechselwirkungen, VII. Weitere Donor-Akzeptor-[2.2]Paracyclophane des Chinhydron-Typs (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3351-3357 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Orientation Effects on Charge-Transfer Interactions. VII. Further Donor-Acceptor [2.2]Paracyclophanes of the Quinhydrone TypeAs further donor-acceptor [2.2]paracyclophanes with different donor-acceptor orientation, the diastereomeric pairs ¾ and ⅚ were synthesized: 3 was formed when tetrahydroxy[2.2]paracyclophane (obtained by hydrogenation of 7) was methylated uncompletely and then oxidized; 3 was also prepared from 8 by hydrolysis of the Birch reduction product 9;4 was obtained analogously starting from 10.5 and 6 were synthesized by silylation of 1 and 2. - In agreement with the results reported for the [2.2]paracyclophane quinhydrones ½, the pseudo-ortho compounds 3 and 5 show, in comparison with the pseudogeminal isomers 4 and 6, resp., for the long-wavelength charge-transfer absorption (400-600 nm) an intensity reduction by about a factor of ten and an additional charge-transfer absorption around 350 nm.
    Notes: Als weitere Donor-Akzeptor-[2.2]Paracyclophane mit unterschiedlicher Donor-Akzeptor-Orientierung wurden die Diastereomeren-Paare ¾ und ⅚ dargestellt: 3 entstand, als das durch Hydrierung von 7 erhaltene Tetrahydroxy[2.2]paracyclophan unvollständig methyliert und anschließend oxidiert wurde, sowie aus 8 bei der Hydrolyse des Birch-Reduktionsproduktes 9;4 erhielt man entsprechend ausgehend von 10.5 und 6 wurden durch Silylierung von 1 und 2 dargestellt.  -  Wie bei den [2.2]Paracyclophan-Chinhydronen ½ zeigen die pseudo-ortho-Verbindungen 3 und 5 im Vergleich zu den pseudogeminalen Isomeren 4 bzw. 6 eine etwa zehnfach geringere Extinktion der langwelligen Charge-Transfer-Bande im Bereich 400-600 nm sowie eine zusätzliche Charge-Transfer-Absorption um 350 nm.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771101014
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  • 4
    Electronic Resource
    Electronic Resource
    Letters to the editor (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 774-776 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230527
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  • 5
    Electronic Resource
    Electronic Resource
    Growth rate of an ice crystal in subcooled pure water (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 294-303 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: New and extensive experimental data on the rate of growth of ice crystals in the a axis direction in quiescent and slow flowing subcooled pure water show conclusively that thermal natural convection is an important heat transfer mechanism controlling the growth rate. At zero and low forced velocities, steady growth is observed only when the crystals grow horizontally or upward. Steady downward growth does not occur in quiescent water. This is consistent with the physical properties of water and the phenomenon of thermal natural convection.Growth rates at high water flow rates vary as the square root of the forced velocity and the 3/2 power of the subcooling and follow the theory of Fernandez and Barduhn (1967) with the ice-water interfacial energy set at 52 mJ/m2 (52 erg/cm2).
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230312
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersed phase mass transfer during drop formation under jetting conditions (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 701-714 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A recent design procedure for perforated plate extraction columns requires extension to include jetting conditions at each perforation. For this purpose, correlations are obtained for jet length, jet contraction, drop size, and mass transfer coefficients in disperse phase controlled liquid-liquid systems. Experimental variables include nozzle size, flow velocity, and physical properties.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230512
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  • 7
    Electronic Resource
    Electronic Resource
    Multivariable computer control of a butane hydrogenolysis reactor: Part I. State space reactor modeling (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 732-742 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A state space model is developed for an existing nonadiabatic packed-bed reactor which experiences axial and radial concentration and temperature gradients resulting from highly exothermic reactions involving several chemical species. The set of partial differential equations is reduced from three to two dimensions using orthogonal collocation. Further use of orthogonal collocation on the quasi steady state version of the differential equations results in a set of coupled algebraic and differential equations from which a linearized low-order state space model is obtained. The model parameters are estimated from reactor data, and the fitted model is used for design and implementation of a multivariable stochastic control schemes on the reactor. These applications are described in parts II and III of this paper.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230516
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of single stationary objects placed in the fluid stream on mass transfer rates to the tube walls (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 125-128 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230120
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  • 9
    Electronic Resource
    Electronic Resource
    On the surface diffusion of adsorbable gases through porous media (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 347-352 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A model is proposed for the hopping mechanism of surface diffusing molecules, adsorbed on porous solids, which allows a simple calculation of the mean hopping distance as a function of surface coverage.Surface permeabilities calculated with this model are compared to new experimental data. A satisfactory agreement is obtained, and the values of the parameters involved turn out to be very reasonable.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230319
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  • 10
    Electronic Resource
    Electronic Resource
    An improved corresponding states method for polar fluids: Correlation of second virial coefficients (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 685-695 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An improved four-parameter corresponding states method that includes polar fluids has been developed. The four parameters are the critical temperature, the critical pressure, the radius of gyration, and a newly developed polarity factor based on the second virial coefficient. These parameters have been used to empirically correlate pure and interaction second virial coefficients of a variety of fluids.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230510
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