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  • Wiley-Blackwell  (1,384)
  • 1965-1969  (1,323)
  • 1935-1939  (61)
  • 1969  (724)
  • 1967  (599)
  • 1937  (61)
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  • 1965-1969  (1,323)
  • 1935-1939  (61)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The first excited triplet states of the nucleotide bases calculated with different semiempirical SCF schemes (1969)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 79-92 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The π-electron distributions, spin densities, and energies of the first triplets of the nucleotide bases, uracil, thymine, cytosine, adenine, and guanine, were investigated in various semiempirical approximations. Results are presented for calculations using the semiempirical form of the closed-shell SCF configuration interaction method, of the different orbitals for different spins (unrestricted Hartree-Fock) treatment, with and without spin projection, and of the Roothaan's open-shell procedure.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560030112
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  • 2
    Electronic Resource
    Electronic Resource
    Radiation-induced emulsion polymerization of vinyl acetate and styrene (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 1175-1189 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Studies have been made of the γ-induced emulsion polymerization of styrene and comparisons made with chemically initiated emulsion polymerization. The polymerization proceeded smoothly to high conversions at 0 and 60°C, the reaction showing a high G (monomer) value. Complete conversions were obtained with total doses of less than 0.05 Mrad. In accordance with the behavior expected of systems having a constant rate of initiation, the molecular weight was found to decrease with decreasing temperature. The molecular weight and particle size distributions were narrower than those obtained in chemically initiated emulsion polymerizations at the same temperature. The radiation-induced emulsion polymerization of vinyl acetate proceeded smoothly at temperatures in the range 0-50°C to give polymers of much higher molecular weight than these obtained from chemically initiated polymerizations at the same temperature. Complete conversion was attained after a dose of 0.02 Mrad for latices approaching 50% solids. The elimination of ionic endgroups in the poly(vinyl acetate) radicals tends to drive the polymerization from the aqueous phase, resulting in faster rates and higher molecular weights than are obtained from chemically initiated systems. Rates of polymerization were found to be independent of temperature and the molecular weight of the polymer to be independent of dose rate. Latices of poly(vinyl acetate) of high solids content were evaluated for latex and film properties and found to have improvements over commercially available samples in both areas, especially in clarity of film and scrub resistance. A number of acrylate and maleate esters were copolymerized with vinyl acetate in a radiation-initiated emulsion system. High molecular weight copolymers were produced after low dose.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070130607
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  • 3
    Electronic Resource
    Electronic Resource
    Neuere Methoden der präparativen organischen Chemie VIDie Beiträge dieser Reihe sind gesammelt in fünf Bänden im Verlag Chemie, Weinheim/Bergstr., erschienen. Sie liegen auch in englischer Ausgabe vor. - Dieser Beitrag wird - erweitert um präparative Vorschriften - in Band VI der Reihe erscheinen.. Diazogruppen-Übertragung (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 786-801 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Arensulfonylazide, und zwar vorzugsweise p-Tosylazid, reagieren mit Verbindungen, die aktive Methylengruppen aufweisen, in Gegenwart einer Base formal unter Austausch einer Diazogruppe gegen zwei Wasserstoffatome, wobei Diazoverbindungen neben Arensulfonsäureamiden entstehen. Die Methode eignet sich zur Synthese der Diazoderivate von Cyclopentadienen, Cyclohexadienen, 1,3-Dicarbonyl-, 1,3-Disulfonyl- und 1,3-Ketosulfonyl-Verbindungen, von Ketonen, Carbonsäureestern und ß-Iminoketonen. Folgereaktionen der Diazosynthese können zu Azoverbindungen und Heterocyclen wie 1,2,3-Triazolen, 1,2,3-Thiadiazolen und Pyrazolin-4-onen führen. Azidiniumsalze reagieren nach dem gleichen Schema, aber im sauren Bereich, was zuweilen Vorteile bringt.
    Additional Material: 11 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670791707
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  • 4
    Electronic Resource
    Electronic Resource
    Light scattering from PVC solutions (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 1305-1308 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.160050626
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  • 5
    Electronic Resource
    Electronic Resource
    Photopolymerization studies: I. Polymers from new photoredox catalyst systemPresented at the SPE First Technical Conference on Photopolymers, Ellenville, N. Y., November 5-7, 1967. (1969)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 9 (1969), S. 40-48 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A new photoredox catalyst is described wherein a phenothiazine dye in its excited state oxidizes a catalyst to a free radical. This free radical efficiently initiates the polymerization of metal acrylates giving rise to polymers which are insoluble in the monomer-containing medium. The polymers precipitate as insoluble colloidal particles. Optical transmission measurements are used to follow the polymerization and to calculate the number and size of the polymer particles. The effect of various factors such as the nature of the catalyst and the photooxidant, the pH and the temperature of the medium on photopolymerization are described. It is indicated that this new system may be useful for rapid photographic imaging and display applications.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760090107
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  • 6
    Electronic Resource
    Electronic Resource
    Synthèse de quelques dérivés de l'amino-3-désoxy-3-érythrose et l'amino-3-désoxy-3-érythrose D-3 (1969)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 315-318 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of derivatives of 3-amino-3-deoxy-L-erythrose by LAH or LAD reduction of the oxime of 1,2-O-isopropylidene α-L-glycero-tetros-3-ulofuranose is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19690520135
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  • 7
    Electronic Resource
    Electronic Resource
    Sur le mécanisme du gonflement des hauts polymères cristallins par les solvants (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 109 (1967), S. 1-8 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Bei Raumtemperatur zu Filmen geformte und dann bei 110°C getemperte Polyäthylenproben wurden bei 85°C in Biphenyl gequollen und dann auf Raumtemp. abgeschreckt.Wie Klein- und Weitwinkel-Röntgenstreuungen zeigen, kristallisiert das Bisphenyl in flachen, etwa 10 Å dicken Kristallen zwischen den Polyäthylen-Einkristallen. Die gequollenen Proben sind fibrillär; sie lassen sich, wie die Elektronenbeugung zeigt, in Einkristalle aufspalten. Die Quellung beeinflußt die Textur der ursprünglichen Polyäthylenprobe nicht, welche eine b-Achsen-Orientierung hat. Die Orientierung der Bisphenylkristalle hängt nur von der Polyäthylentextur ab; Bisphenyl hat hier ebenfalls b-Achsen-Orientierung, die parallel zur Orientierung des Polyäthylens ist.
    Notes: Specimens of polyethylene laminated at room temperature and annealed at 110°C were swelled at 85°C by biphenyl and then quickly allowed to cool to room temperature.X-ray diffraction studies at large and low angles revealed that during the cooling process, biphenyl crystallizes into flat crystals of about 10 Å thickness, located between the polyethylene single crystals. The swelled specimens are friable. It is possible to desaggregate them into single crystals as shown by electron diffraction. Swelling does not affect the texture of the initial polyethylene specimens which is that of a b̄ axis fibre. Further more during the cooling process the orientation taken by the biphenyl crystals depends only on the polyethylene texture. The texture of biphenyl is that of a b̄ axis fibre parallel to the polyethylene fibre.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1967.021090101
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  • 8
    Electronic Resource
    Electronic Resource
    Cyclopolymerization of diastereomeric diepoxides (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2067-2077 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The meso- and d,l-diastereomers of o-bis(epoxyethyl)benzene have been synthesized and identified. The diastereomers were polymerized by a variety of catalysts to give a polymer which has mainly isochroman recurring units as a result of a cyclopolymerization mechanism. Some features of the polymerization with the triisobutylaluminum catalyst system have been studied. The rates of polymerization of the monomers and the transition temperatures of the resulting polymers have been determined. The results are explained on the basis of a controlled intramolecular propagation and a stereospecific polymerization.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050823
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  • 9
    Electronic Resource
    Electronic Resource
    The addition of methyl radicals to tetrafluoroethylene (1969)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 1 (1969), S. 571-580 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The addition of methyl radicals to tetrafluoroethylene in the gas phase has been studied over the temperature range 80-180°C, using a material balance method. \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm CH}_{\rm 3} + {\rm C}_2 {\rm F}_{\rm 4} \to {\rm CH}_3 {\rm C}_2 {\rm F}_4 $$\end{document}Arrhenius parameters of 1011.95±0.23 (mole-1 cm3 sec-1) and 5.7 ± 0.4 (kcal/mole) have been measured for the addition reaction.Electrophilic reagents such as O or CF3 appear to react almost equally readily with ethylene and tetrafluoroethylene but methyl radicals add much more rapidly to tetrafluoroethylene than to ethylene, the difference in reactivity being principally due to an activation energy difference of ∼2 kcal/mole.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550010607
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  • 10
    Electronic Resource
    Electronic Resource
    The polymerization of styrene oxide by the triisobutylaluminum-water system (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 2055-2065 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Styrene oxide has been polymerized by the triisobutylaluminum-water catalyst system. Kinetic studies of the effects of varying the monomer, triisobutylaluminum, and water concentrations in benzene solutions have been made. Styrene oxide was consumed in two reactions: an initial fast one producing trimer and a slower reaction forming higher molecular weight polymer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050822
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